/*images*/
  var	imgGreenCheck		= new Image(23,23); 
  	imgGreenCheck.src	= gsib+'/img/global/inp-c.gif';

  var	imgRedX			= new Image(23,23); 
  	imgRedX.src		= gsib+'/img/global/inp-x.gif';


/* prototypes */
String.prototype.trim = function() {
	return this.replace(/^\s+|\s+$/g,"");
}

/* HEADER RELATED */
	/* top search box */
/**
 * TBCOM - wipes out the default text (if present) in the top text search box
 */
function tbTopSearchClear() {
	sObj	= document.getElementById('topNavSearchText');
	if (sObj.value == 'Enter an ISBN, title, author or keyword(s)')
		sObj.value = '';
}
function tbTopSearchReset() {
	sObj	= document.getElementById('topNavSearchText');
	if (sObj.value == '')
		sObj.value = 'Enter an ISBN, title, author or keyword(s)';
}
function tbBuySearchClear() {
	sObj	= document.getElementById('search');
	if (sObj.value == 'Enter an ISBN, title, author or keyword(s)')
		sObj.value = '';
}
function tbBuySearchReset() {
	sObj	= document.getElementById('search');
	if (sObj.value == '')
		sObj.value = 'Enter an ISBN, title, author or keyword(s)';
}

function tbHpSearchClear() {
	sObj	= document.getElementById('search');
	if (sObj.value == 'Enter an ISBN, title, author or keyword(s)')
		sObj.value = '';
}
function tbHpSearchReset() {
	sObj	= document.getElementById('search');
	if (sObj.value == '')
		sObj.value = 'Enter an ISBN, title, author or keyword(s)';
}
	/* top tab mouseovers */
function tbHeadTab(tabId, typeId) {
	var imgArr	= new Array('buy','sell','etext','whyus');
	document.getElementById('hdtb'+tabId).src	= gsib+'/img/global/nav_'+String(imgArr[tabId])+'_'+((typeId == 1)?'on':'off')+'.gif';
}



window.onscroll = function() {

	var aPgDims	= getPageSizeWithScroll();
	var aPgX	= aPgDims[0];
	var aPgY	= aPgDims[1];

	var iScrTop	= (self.pageYOffset)?self.pageYOffset:truebody().scrollTop;
	var iSpc	= document.getElementById('tbFtr').offsetHeight+30;

	if (String(document.getElementById('ctBox')) != 'null') {
		if (iScrTop >= 105) {
			var iBoxHeight	= document.getElementById('ctBox').offsetHeight;
			var iMaxYFloat	= aPgY-iSpc-iBoxHeight;
			var iCtTop	= 0-(iScrTop-iMaxYFloat);

			document.getElementById('ctBox').style.position	= 'fixed';
			document.getElementById('ctBox').style.top	= (iScrTop >= iMaxYFloat)?iCtTop:0;
		}
		else if (iScrTop < 105) {
			document.getElementById('ctBox').style.position	= 'absolute';
			document.getElementById('ctBox').style.top	= 'auto';
		}
	}
	if (String(document.getElementById('coSumTbl')) != 'null') {
		if (iScrTop >= 224) {
			var iBoxHeight	= document.getElementById('coSumTbl').offsetHeight;
			var iMaxYFloat	= aPgY-iSpc-iBoxHeight+40;
			var iCtTop	= 0-(iScrTop-iMaxYFloat);

			document.getElementById('coSumTbl').style.position	= 'fixed';
			document.getElementById('coSumTbl').style.top		= (iScrTop >= iMaxYFloat)?iCtTop:0;
		}
		else if (truebody().scrollTop < 224 || self.pageYOffset < 224) {
			document.getElementById('coSumTbl').style.position	= 'absolute';
			document.getElementById('coSumTbl').style.top		= 'auto';
		}
	}
	floatSideBar();
}

function getPageSizeWithScroll() {
	if (window.innerHeight && window.scrollMaxY) {// Firefox
		yWithScroll = window.innerHeight + window.scrollMaxY;
		xWithScroll = window.innerWidth + window.scrollMaxX;
	} else if (document.body.scrollHeight > document.body.offsetHeight){ // all but Explorer Mac
		yWithScroll = document.body.scrollHeight;
		xWithScroll = document.body.scrollWidth;
	} else { // works in Explorer 6 Strict, Mozilla (not FF) and Safari
		yWithScroll = document.body.offsetHeight;
		xWithScroll = document.body.offsetWidth;
  	}
	arrayPageSizeWithScroll = new Array(xWithScroll,yWithScroll);
//alert( 'The height is ' + yWithScroll + ' and the width is ' + xWithScroll );
	return arrayPageSizeWithScroll;
}

/* CART RELATED */
	/* add to cart */
function tbATCImgFlip(cartImg, imgArr, imgIdx) {
	cartImg.src	= imgArr[imgIdx];
}
	/* cart flyout */

// the first cart item
var ctTopItem	= 0;
var ctItemTimer	= null;
var lastDir	= 1;
var opacTimer	= -1;
var flyTimer	= -1;
var flyoutObj	= "";

function tbCartShowFlyout(objTd, arrIdx) {
	var foB	= document.getElementById('cartFOB');

	var ctRowId	= objTd.id;
	
	var arTopPos	= new Array()
	arTopPos["ctItemRow0"]	= 159;
	arTopPos["ctItemRow1"]	= 265;
	arTopPos["ctItemRow2"]	= 371;

	if (flyTimer != -1)
		clearTimeout(flyTimer);

// ct subtotal
	subtotal	= new String(document.getElementById("tbSubtotal").innerHTML).replace(/\D/g, "");
	iSubtotal	= (!isNaN(subtotal))?parseInt(subtotal)/100:0;

// set scrolltop
	scrTop	= (document.all)?truebody().scrollTop:self.pageYOffset;

	var idxPull						= arrIdx+ctTopItem;
	if (idxPull > ctItms.length-1)
		idxPull	= idxPull-(ctItms.length);
	var infArr						= ctItms[idxPull];

// free ship
	sFSMsg		= (iSubtotal >= 25 && String(infArr[7]).toLowerCase() == 'textbooks.com')?'FREE SHIPPING':'';

	document.getElementById('ctItmBkTtl').innerHTML		= String(infArr[0]);
	document.getElementById('ctItmBkAut').innerHTML		= String(infArr[1]);
	document.getElementById('ctItmBkCond').innerHTML	= String(infArr[2]);
	document.getElementById('ctItmBkPri').innerHTML		= String(infArr[3]);

// line savings
	document.getElementById('ctItmBkSave').innerHTML	= (String(infArr[4]) != "$0.00")?"(save&nbsp;"+String(infArr[4])+")":"";

	document.getElementById('ctItmBkFS').innerHTML		= sFSMsg;
	document.getElementById('ctItmSeller').innerHTML	= String(infArr[7]);
	gbVal	= new String(infArr[5]);
	if (gbVal != '$0.00' && gbVal != "") {
		document.getElementById('ctItmBkGB').innerHTML		= "" +
			"<div style='width:328px;height:8px;border:0;'></div>" +
			"<img src='"+gsib+"/img/global/ctfob-gb-sep.gif'><br>" +
			"<img src='"+gsib+"/img/global/ctfob-gb.gif' align=absmiddle> " +
			"Guaranteed Cash Back: " + gbVal;
        }
        else {
		document.getElementById('ctItmBkGB').innerHTML		= "";
        }
        
	topOffset	= Math.round(objTd.offsetHeight/2);

	if (document.all) {
		document.getElementById('cartFOB').style.background	= 'url('+gsib+'/img/global/cart-flyout.gif)';
	}

	foB.x		= getposOffset(objTd, "left");
	foB.y		= getposOffset(objTd, "top")+((scrTop >= 105)?scrTop:0)-topOffset+20;
	foB.style.left	= foB.x-(parseInt(foB.style.width)-5)+"px";
	foB.style.top	= (foB.y-clearbrowseredge(objTd, "bottomedge", foB))+"px";

	foB.style.display	= 'inline';
	high(foB);
	objTd.className		= 'ctBkImgMO';
	flyoutObj		= objTd;
}

function tbCartHideFlyout(objTd) {
	objTd.className		= 'ctBkImg';
	low(document.getElementById('cartFOB'));
}

function tbCartItemIterate(intDir) {
// -1 means go back, 1 means go forward
	if (intDir == null)
		intDir	= lastDir;

	lastDir	= intDir;
	ctItem	= (ctTopItem+intDir);

	if (ctItem < 0)
		ctItem	= ctItms.length-1;
	if (ctItem > ctItms.length-1)
		ctItem	= 0;

	ctTopItem	= ctItem;

	ctRows		= ctItms.length;
	maxLoops	= (ctRows > 3)?3:ctRows;

	for (var cii=0;cii<maxLoops;cii++) {
		with (document) {
			thisArr					= ctItms[ctItem];
			getElementById("ctBkImg"+cii).src	= thisArr[6];
		}
		ctItem	= (ctItem+1 > ctItms.length-1)?0:ctItem+1;
	}
}


/* BOOK RELATED */
	/* book description */
var currTab	= new Number(0);
function setCntTab(tabId) {
	document.getElementById('cntTb' + currTab).className	= 'bkInfoBtn0';
	document.getElementById('cntStr' + currTab).className	= 'hid';
	document.getElementById('cntTb' + tabId).className	= 'bkInfoBtn1';
	document.getElementById('cntStr' + tabId).className	= 'vis';
	currTab	= tabId;
}
	/* shows more detail on book description */
function tbBkShowMoreInfo(cntId) {
	document.getElementById('readMoreImg' + cntId).className	= 'hid';
	document.getElementById('readFull' + cntId).className		= 'vis';
}


/* SEARCH RELATED */
function tbSrchOpenFilters() {
	document.getElementById("sfltOpnBlk").className	= 'hid';
	document.getElementById("sfltClsBlk").className	= 'sflt_box';
}

function tbSrchCloseFilters() {
	document.getElementById("sfltOpnBlk").className	= 'vis';
	document.getElementById("sfltClsBlk").className	= 'hid';
}

function toggleNav(navId, flipId) {
	document.getElementById(navId+'More').style.display	= (flipId==0)?'inline':'none';
	document.getElementById(navId+'Less').style.display	= (flipId==1)?'inline':'none';
}


/* GLOBAL */
	/* grabs the offset value of a page object */
function caloffset(what, offsettype){
	var totaloffset	= (offsettype == "left")?what.offsetLeft:what.offsetTop;
	var parentEl	= what.offsetParent;
	while (parentEl!=null){
		totaloffset	= (offsettype == "left")?totaloffset+parentEl.offsetLeft:totaloffset+parentEl.offsetTop;
		parentEl	= parentEl.offsetParent;
	}
	return totaloffset;
}


function tbSetFormImage(sImageName, iZeroOrOne, iScrollTo, sMsgString) {
	document.getElementById(sImageName).src	= (iZeroOrOne == 0)?imgRedX.src:imgGreenCheck.src;
//	if (sMsgString != "")
//		alert(sMsgString);

}




var vertical_offset	= "0px"; //horizontal offset of tooltip from anchor link
var horizontal_offset	= "-3px"; //horizontal offset of tooltip from anchor link

function getposOffset(what, offsettype) {
	var totaloffset=(offsettype=="left")? what.offsetLeft : what.offsetTop;
	var parentEl=what.offsetParent;
	while (parentEl!=null) {
		totaloffset=(offsettype=="left")? totaloffset+parentEl.offsetLeft : totaloffset+parentEl.offsetTop;
		parentEl=parentEl.offsetParent;
	}
	return totaloffset;
}

function clearbrowseredge(obj, whichedge, whichFloater){
	var edgeoffset=(whichedge=="rightedge")? parseInt(horizontal_offset)*-1 : parseInt(vertical_offset)*-1;
	if (whichedge=="rightedge") {
		var windowedge	= (document.all && !window.opera)? truebody().scrollLeft+truebody().clientWidth-15 : window.pageXOffset+window.innerWidth-15;
		whichFloater.contentmeasure=whichFloater.offsetWidth;
		if (windowedge-whichFloater.x < whichFloater.contentmeasure)
			edgeoffset=whichFloater.contentmeasure-obj.offsetWidth;
	}
	else {
		var windowedge = (document.all && !window.opera)? truebody().scrollTop+truebody().clientHeight-15 : window.pageYOffset+window.innerHeight-18;
		whichFloater.contentmeasure=whichFloater.offsetHeight;
		if (windowedge-whichFloater.y < whichFloater.contentmeasure)
			edgeoffset=whichFloater.contentmeasure+obj.offsetHeight;
	}
	return edgeoffset;
}




/* TOOLTIP RELATED */
var tipwidth='150px' //default tooltip width
var tipbgcolor='lightyellow'  //tooltip bgcolor
var disappeardelay=250  //tooltip disappear speed onMouseout (in miliseconds)

/////No further editting needed

var ie4=document.all
var ns6=document.getElementById&&!document.all

//if (ie4||ns6)
//document.write('<div id="fixedtipdiv" style="visibility:hidden;width:'+tipwidth+';background-color:'+tipbgcolor+'" ></div>')



function showhide(obj, e, visible, hidden, tipwidth){
if (ie4||ns6)
dropmenuobj.style.left=dropmenuobj.style.top=-500
if (tipwidth!=""){
dropmenuobj.widthobj=dropmenuobj.style
dropmenuobj.widthobj.width=tipwidth
}
if (e.type=="click" && obj.visibility==hidden || e.type=="mouseover")
obj.visibility=visible
else if (e.type=="click")
obj.visibility=hidden
}


function tbDoTT(tipId, obj, e, tipwidth) {
	if (window.event) event.cancelBubble=true
	else if (e.stopPropagation) e.stopPropagation()

	clearhidetip()
	dropmenuobj	= (document.getElementById)?document.getElementById(tipId):fixedtipdiv
//	dropmenuobj.innerHTML=menucontents

	if (ie4||ns6){
		showhide(dropmenuobj.style, e, "visible", "hidden", tipwidth)
		dropmenuobj.x=getposOffset(obj, "left")
		dropmenuobj.y=getposOffset(obj, "top")
		dropmenuobj.style.left	= dropmenuobj.x-clearbrowseredge(obj, "rightedge", dropmenuobj)+"px"
		dropmenuobj.style.top	= dropmenuobj.y-clearbrowseredge(obj, "bottomedge", dropmenuobj)+obj.offsetHeight+"px"
	}
}

function hidetip(e){
if (typeof dropmenuobj!="undefined"){
if (ie4||ns6)
dropmenuobj.style.visibility="hidden"
}
}

function delayhidetip(){
if (ie4||ns6)
hidetip();
//delayhide=setTimeout("hidetip()",disappeardelay);
}

function clearhidetip(){
if (typeof delayhide!="undefined")
clearTimeout(delayhide)
}











/* OPACITY RELATED */
function opacity(id, opacStart, opacEnd, millisec, whichDir) { 

	if (window.opacTimer)
		clearTimeout(opacTimer);

//speed for each frame 
	var speed = 30; // Math.round(millisec / 100); 

	changeOpac(opacStart, id);

    //determine the direction for the blending, if start and end are the same nothing happens 
    if (whichDir < 0) { 
	if (opacStart == 0) {
		document.getElementById(id).style.display	= 'none';
	}
	else {
		opacStart	= opacStart-10;
		if (opacStart <= 0) opacStart = 0;

		opacTimer	= setTimeout("opacity('"+id+"',"+opacStart+","+opacEnd+","+millisec+","+whichDir+")", speed);
	}
    }
    else { 
	if (opacStart < 10)
		document.getElementById(id).style.display	= 'block';

	opacStart	= opacStart+10;
	if (opacStart >= 100) opacStart = 100;

	if (opacStart <= 100) {
		opacTimer	= setTimeout("opacity('"+id+"',"+opacStart+","+opacEnd+","+millisec+","+whichDir+")", speed);
	}
    } 
} 

//change the opacity for different browsers 
function changeOpac(opacity, id) { 
    var object = document.getElementById(id).style; 
    object.opacity = (opacity / 100); 
    object.MozOpacity = (opacity / 100); 
    object.KhtmlOpacity = (opacity / 100); 
    object.filter = "alpha(opacity=" + opacity + ")"; 
} 

function high(which2) {
	opacity(which2.id, 0, 100, 50, 1)
}

function low(which2) {
	opacity(which2.id, 100, 0, 50, -1)
}


/* LIGHTBOX RELATED */
// you want to use paypal?
	var ppOpt	= new String("");
		ppOpt	= "<font class='reg12px'>" +
			"You have selected to use PayPal as your payment method." +
			"<P>Is this correct?</p>" +
			"<small class='reg11px'>* You will be redirected to the PayPal site.</small>" +
			"<P align=center>" +
			"	<a href='#' onClick='coSetPaytype(0);tbHideLightbox();'><img src='"+gsib+"/img/acct/ma-cancel.gif' width=71 height=25 border=0 alt='[ Cancel ]'></a> &nbsp; &nbsp; " +
			"	<a href='#' onclick='PayPalGo(2); return false'><img src='"+gsib+"/img/co/co-ok.gif' width=71 height=25 border=0 alt='[ Ok? ]'></a>" +
			"</p>" +
			"</font>";

// what is paypal?
	var ppWot	= new String("");
		ppWot	= "<p>PayPal, the trusted leader in online payments, enables buyers and businesses to send and receive money online. PayPal has over 100 million member accounts in 190 countries and regions. It's accepted by merchants everywhere, both on and off eBay.<br>" +
			"<br>" +
			"<span class='emphasis'>Is it safe to use?</span><br>" +
			"PayPal helps protect your credit card information with industry-leading security and fraud prevention systems. When you use PayPal, your financial information is never shared with the merchant.<br>" +
			"<br>" +
			"<span class='emphasis'>Why use PayPal?</span></p>" +
			"<ul>" +
			"<li>Make purchases or send money with PayPal &#151; it's free</li>" +
			"<li>Shop and pay conveniently by saving your information with PayPal</li>" +
			"<li>PayPal is accepted by millions of businesses worldwide and is the preferred payment method on eBay</li>" +
			"</ul>" +
			"<p><a target='_blank' href='https://www.paypal.com/us/cgi-bin/webscr?cmd=_registration-run'>Start using PayPal</a> today!</p>";

// marketplace explanation
/*
	var mpExplain	= new String("");
		mpExplain	= "<P>The Textbooks.com Marketplace is another way we bring you the most choices to find the books you need at the right price. Each seller is pre-approved to meet our standards of quality and reliability. " +
				"<P><b>Marketplace Tips</b><br>" +
				"<ol><li> Marketplace orders ship directly from the seller and do not qualify for free shipping.<br>" +
				"<li> Delivery: Marketplace sellers are required to ship any item ordered within 2 business days of being notified of the order. Marketplace books ship via two shipping methods: Standard Delivery or Domestic Express.<br>" +
				"<li> Orders containing a marketplace book cannot be purchased using PayPal.<br>" +
				"<li> To help you select the book that's right for you, each book's condition is classified by the seller. Here our are standards:" +
				"<table><tr><td style='padding:12px;'><b>New</b> - A book that is unread and has no defects whatsoever." +
				"<P><b>Like New</b> - A book that may have been handled several times or used slightly but that nevertheless has no defects of note and no signs of wear or aging. A \"Like New\" book is suitable to give as a gift. " +
				"<P><b>Very Good</b> - A book that may have minor signs of wear or aging. Similar to books in \"Like New\" condition, \"Very Good\" books do not have any tears or damage to the pages or binding and do not contain markings or highlighting. " +
				"<P><b>Good</b> - A book that shows more general signs of wear. The spine may be cracked or pages may have yellowed. This book may also contain markings or highlighting. All specific defects should be noted in the Comments section associated with each used book. " +
				"<p><b>Acceptable</b> - A book that is readable, with all pages intact, but showing significant signs of wear. This book may have defects such as damage to its spine or cover and may also contain markings or highlighting. All specific defects should be noted in the Comments section associated with each used book." +
				"</td></tr></table>" +
				"<li> Marketplace items may be returned directly to the seller within 30 days from the date of purchase.</ul>" +
				"<P>For all questions about the <a href='"+gup+"/CustServ-HowToShop.php?CSID="+sId+"#mp'>Textbooks.com Marketplace</a>.";
*/

// marketplace co blurb
	var mpBlurb	= new String("<P>The Textbooks.com Marketplace is another way we bring you the most choices to find the books you need at the right price. Each seller is pre-approved to meet our standards of quality and reliability. ");

// marketplace explanation
	var mpExplain	= new String("");
		mpExplain	= "<P>The Textbooks.com Marketplace is another way we bring you the most choices to find the books you need at the right price. Each seller is pre-approved to meet our standards of quality and reliability. " +
				"<p>For tips and general information about the Textbooks.com Marketplace, <a href='"+gup+"/custserv-marketplace-tips.php'>click here</a>." +
				"<P>For shopping questions about the Textbooks.com Marketplace, <a href='"+gup+"/CustServ-HowToShop.php?CSID="+sId+"#mp'>click here</a>.";

function tbShowLightbox(sHtml, sHeading, blnContentContainsClose) {
	var sLBContent	= new String("");

	blnContentContainsClose	= (blnContentContainsClose == null)?false:blnContentContainsClose;

	if (sHeading != null && sHeading != "") {
		sLBContent	= "<b>"+sHeading+"</b><P>";
	}

	sLBContent	+= sHtml;

	document.getElementById('divLBC').className	= (blnContentContainsClose)?'hid':'lbClose';
	document.getElementById('lbCnt').className	= 'lbContent';
	document.getElementById('lbCnt').innerHTML	= sLBContent;
//	document.getElementById('light').style.display	='block';
	high(document.getElementById('light'));

	document.getElementById('fade').style.display	='block';

	floatSideBar('light');
}

function tbHideLightbox() {
//	document.getElementById('light').style.display	='none';
	low(document.getElementById('light'));

	document.getElementById('fade').style.display	='none';
}

function tbShowPrintLayer(sUrlToLoad, sPrintText) {
	document.getElementById('printFrm').src			= sUrlToLoad;
	document.getElementById('printTxt').innerHTML		= sPrintText;
	document.getElementById('printdiv').style.display	= 'block';
	floatSideBar('printdiv');
	document.getElementById('printfade').style.display	= 'block';

	return false;
}

function tbHidePrintLayer() {
	document.getElementById('printFrm').src			= '';
	document.getElementById('printTxt').innerHTML		= '';
	document.getElementById('printdiv').style.display	= 'none';
	document.getElementById('printfade').style.display	= 'none';
}

function tbPrintLayerGo() {
	if (document.all) {
		document.printFrm.focus();
		document.printFrm.print();
	}
	else {
		window.frames['printFrm'].focus();
		window.frames['printFrm'].print();
	}
}

function tbShowInfoLayer(sUrlToLoad, sInfoText) {
	document.getElementById('infoFrm').src			= sUrlToLoad;
	document.getElementById('infoTxt').innerHTML		= sInfoText;
	document.getElementById('infodiv').style.display	= 'block';
	document.getElementById('printfade').style.display	= 'block';

	floatSideBar('infodiv');

	return false;
}

function tbHideInfoLayer() {
	document.getElementById('infoFrm').src			= '';
	document.getElementById('infoTxt').innerHTML		= '';
	document.getElementById('infodiv').style.display	= 'none';
	document.getElementById('printfade').style.display	= 'none';
}



bY	= 0;
lPY	= 0;
lId	= '';
function floatSideBar(id) {
	if (id == null || String(id) == 'undefined') id = (lId != '')?lId:'light';
//pageY, pageHeight, boxHeight
	var pY,pH,bH	= 'light'; 

	var pDims	= getDimsWH();
	var sDims	= getScrollXY();

	pY	=  sDims[1]; // (navigator.appName.indexOf("Netscape")!=-1)?pageYOffset:((nn&&document.html.scrollTop)?document.html.scrollTop:truebody().scrollTop);

	var lPx	= ((pDims[0]-document.getElementById(id).offsetWidth)/2);

//	if (pY != lPY || id != lId) { //they scrolled or new item called

	pH = pDims[1]; 
	bH = document.getElementById(id).offsetHeight; 

	bY = (pH/2)-(bH/2)+pY; 

	document.getElementById(id).style.top = bY+'px';
	document.getElementById(id).style.left = lPx+'px';

//	}
	lPY	= pY;
	lId	= id;

}

function getDimsWH() {
  var myWidth = 0, myHeight = 0;
  if( typeof( window.innerWidth ) == 'number' ) {
    //Non-IE
    myWidth	= window.innerWidth;
    myHeight	= window.innerHeight;
  }
  else {
    //IE compatible
    myWidth	= truebody().clientWidth;
    myHeight	= truebody().clientHeight;
  }
  return Array(myWidth,myHeight);
}

function getScrollXY() {
  var scrOfX = 0, scrOfY = 0;
  if( typeof( window.pageYOffset ) == 'number' ) {
    //Netscape compliant
    scrOfY = window.pageYOffset;
    scrOfX = window.pageXOffset;
  }
  else {
    // IE standards compliant mode
    scrOfY = truebody().scrollTop;
    scrOfX = truebody().scrollLeft;
  }
  return Array(scrOfX, scrOfY);
}

/* CHECKOUT RELATED */
function tbCOS1() {
	zip	= document.getElementById("shipzip");
	if (isNaN(Number(zip.value)) || String(zip.value).length != 5) {
		alert("Please enter a valid shipping zip code, and click the 'Go' button to view shipping methods");
		zip.focus();
		return false;
	}
	if (!getRadioValue('ShipMethod')) {
		alert("Please select a shipping method.");
		return false;
	}
	return true;
}

function getRadioValue(radioGroupName) {
	if (String(document.getElementsByName(radioGroupName)) != "null") {
		radios = document.getElementsByName(radioGroupName);
		for (i = 0; i < radios.length; i++) {
		    if (radios[i].checked) return radios[i].value;
		}
	}
	else {
		alert("no radios!");
	}
	return false;
}

/* SELL RELATED */
/**
 * TBCOM - wipes out the default text (if present) in the top text search box
 */
function tbSellSearchClear() {
	sObj	= document.getElementById('bb_isbns');
	if (sObj.value == 'Enter ISBN numbers only - One or several will work')
		sObj.value = '';
}
function tbSellSearchReset() {
	sObj	= document.getElementById('bb_isbns');
	if (sObj.value == '')
		sObj.value = 'Enter ISBN numbers only - One or several will work';
}

/* ACCOUNT RELATED */
function tbMATabs(tabId) {
	with (document) {
		getElementById("mat0").src		= gsib+"/img/acct/ma-bip-"+((tabId == 0)?1:0)+".gif";
		getElementById("mad0").className	= (tabId == 0)?"maSect":"hid";
		getElementById("mat1").src		= gsib+"/img/acct/ma-bis-"+((tabId == 1)?1:0)+".gif";
		getElementById("mad1").className	= (tabId == 1)?"maSect":"hid";
		getElementById("mat2").src		= gsib+"/img/acct/ma-mi-"+((tabId == 2)?1:0)+".gif";
		getElementById("mad2").className	= (tabId == 2)?"maSect":"hid";
		getElementById("mat3").src		= gsib+"/img/acct/ma-vb-"+((tabId == 3)?1:0)+".gif";
		getElementById("mad3").className	= (tabId == 3)?"maSect":"hid";
	}
}

function tbMASectTabs(tabId, modId) {
	with (document) {
		if (tabId == 0) {
			getElementById("mad20a").className	= (modId == 0)?"vis":"hid";
			getElementById("mad20b").className	= (modId == 1)?"vis":"hid";
		}

		if (tabId == 1) {
			getElementById("mad21a").className	= (modId == 0)?"vis":"hid";
			getElementById("mad21b").className	= (modId == 1)?"vis":"hid";
		}

		if (tabId == 2) {
			getElementById("mad22a").className	= (modId == 0)?"vis":"hid";
			getElementById("mad22b").className	= (modId == 1)?"vis":"hid";
		}
		if (tabId == 3) {
			getElementById("mad23a").className	= (modId == 0)?"vis":"hid";
			getElementById("mad23b").className	= (modId == 1)?"vis":"hid";
		}
	}
}


function clean_isbn(value) {
	return value.replace(/(^\s+)|(\s+$)|-/g, '');
}

function is_well_formed_isbn(value) {	// assumes value has been cleaned
	return /^\d{9}[xX\d]$/.test(value) || /^\d{13}$/.test(value);
}

function is_valid_isbn(value) {	// assumes value has been cleaned
	if (!/^0{10}$/.test(value) && /^\d{9}[xX\d]$/.test(value)) {
		var sum = 0;
		for (var i = 0; i < 9; ++i)
			sum += (10 - i) * eval(value.charAt(i));
		sum += (value.charAt(9) == 'x' || value.charAt(9) == 'X') ? 10 : eval(value.charAt(9));
		return (sum % 11) == 0;
	}
	else if (!/^0{13}$/.test(value) && /^\d{13}$/.test(value)) {
		var sum = 0;
		for (var i = 0; i < 13; ++i) {
			var n = eval(value.charAt(i));
			if ((i % 2) == 1) n *= 3;
			sum += n;
		}
		return (sum % 10) == 0;
	}
	else return false;
}


/** HOMEPAGE **/
function tbHpTabs(tabId) {
	with (document) {
	// buy
		getElementById('hpt0').src		= gsib+'images/buy-tab'+((tabId == 0)?'1':'0')+'.png';
		getElementById('hpz0').className	= (tabId == 0)?'vis':'hid';
		getElementById('hpfi0').className	= (tabId == 0)?'vis':'hid';
	// sell
		getElementById('hpt1').src		= gsib+'images/sell-tab'+((tabId == 1)?'1':'0')+'.png';
		getElementById('hpz1').className	= (tabId == 1)?'vis':'hid';
		getElementById('hpfi1').className	= (tabId == 1)?'vis':'hid';
	}
// cancel their click event
	return false;
}

/** customer service **/
function csToggleNav(topNm) {

	with (document) {
		if (getElementById(topNm+'Kids').className == 'hid') {
			getElementById(topNm).className		= 'csNavTopOn';
			getElementById(topNm+'Ct').className	= 'vis';
			getElementById(topNm+'Kids').className	= 'vis';
		}
		else {
			getElementById(topNm).className		= 'csNavTopOff';
			getElementById(topNm+'Ct').className	= 'hid';
			getElementById(topNm+'Kids').className	= 'hid';
		}
	}

}

/** error message **/
function tbErrorMsg(sMsg, objHighlight) {
	var objErrBlock	= document.getElementById("frmErr");
		objErrBlock.x=getposOffset(objHighlight, "left");
		objErrBlock.y=getposOffset(objHighlight, "top");
		objErrBlock.style.left	= objErrBlock.x-clearbrowseredge(objHighlight, "rightedge", objErrBlock)-8+"px";
		objErrBlock.style.top	= objErrBlock.y-clearbrowseredge(objHighlight, "bottomedge", objErrBlock)-23+"px";
		objErrBlock.className	= 'vis';
		objErrBlock.style.zIndex	= 2;
		document.getElementById("frmErrTxt").innerHTML	= sMsg;
}

function tbErrorHide() {
	document.getElementById("frmErr").className	= 'hid';
}








// SIGN IN / ACCOUNT DASH LAYER
	var dropboxleft	= 200; //set left position of box (in px)
	var dropboxtop	= 100; //set top position of box (in px)
	var dropspeed	= new Number(15);  //set speed of drop animation (larger=faster)
	var cTop	= new Number(-220);
	var ie		= document.all;
	var dom		= document.getElementById;
	var isVis	= false;
	var loc		= new String(window.location.href);


function tbRPCLoginForm(reqStyle) {
	if (isVis) return false;

	var sUrl	= new String(tbsu+"/login-mini.php?STL="+reqStyle+"&CSID="+sId);

	document.getElementById('silFrm').src		= sUrl;

	scroll(0,0);

	initboxv2();

// we return false, because the click allows non-js browsers to
// see a login page.
	return false;
}

function tbRPCForgotPass() {
	if (isVis) return false;

	var sUrl	= new String(tbsu+"/Pop-Ups-ForgotPass.php?CSID="+sId);

	document.getElementById('silFrm').src		= sUrl;

	scroll(0,0);

	initboxv2();

// we return false, because the click allows non-js browsers to
// see a login page.
	return false;
}

function tbUpdateSignIn(sTnsis, sTnsin) {
	document.getElementById("tnsis").innerHTML	= sTnsis;
	document.getElementById("tnsifn").innerHTML	= sTnsin;
}

function initboxv2() {
	if (window.hidestart) clearInterval(hidestart);
	initBoxPos();
	if (!dom&&!ie)
		return

	if (!isVis) {
		isVis				= true;
		crossboxcover			= document.getElementById("dropinboxv2cover");
		crossbox			= document.getElementById("dropinboxv2");
		scroll_top			= (ie)?truebody().scrollTop:window.pageYOffset;
		crossbox.height			= crossbox.offsetHeight;
		crossboxcover.style.height	= parseInt(crossbox.height)+"px";
		crossbox.style.top		= crossbox.height*(-1)+"px";
		crossboxcover.style.left	= dropboxleft+"px";
		crossboxcover.style.top		= dropboxtop+"px";
		crossboxcover.style.visibility	= (dom||ie)? "visible":"show";
		dropstart			= setInterval("dropinv2()",50);
	}
}

function initBoxPos() {
	var thePlus1		 = new Number(0);
	var thePlus2		 = new Number(0);
	var stopTag		 = new String("BODY");
	var oTbl		 = document.getElementById("tnTabsTbl");

	for(var p=oTbl; p&&p.tagName!=stopTag; p=p.offsetParent) {
		thePlus1	+= p.offsetLeft;
		thePlus2	+= p.offsetTop;
	}

	dropboxleft		= thePlus1+1;
	dropboxtop		= thePlus2+32;
}

function dropinv2() {
	cTop	= parseInt(crossbox.style.top)+dropspeed;
	if (cTop<0) {
		crossboxcover.style.top	= dropboxtop+"px";
		crossbox.style.top	= cTop+"px";
	}
	else {
		clearInterval(dropstart);
		crossbox.style.top	= 0;
	}
}

function dismissboxv2() {
	if (window.dropstart) clearInterval(dropstart);
	if (window.hidestart) clearInterval(hidestart);
	initBoxPos();
	cTop			= parseInt(crossbox.style.top);
	hidestart		= setInterval("hideinv2()",50);
}

function hideinv2() {
	cTop	= parseInt(crossbox.style.top)-dropspeed;
	if (cTop > -220) {
		crossbox.style.top		= cTop+"px";
		cTop	= cTop-dropspeed;
	}
	else {
		clearInterval(hidestart);
		crossboxcover.style.visibility	= (dom||ie)? "hidden":"hide";
		crossbox.style.top		= "-220px";
		isVis				= false;
	}
}

/**
* Determines which hierarchy to use for referring to the document body
*/
function truebody() {
	return (document.compatMode && document.compatMode!="BackCompat")?document.documentElement:document.body;
}

/**
* Hide the sign in layer
*/
function tbSilHide() {
	if (isVis)
		dismissboxv2();
}
// SIGN IN / ACCOUNT DASH LAYER