function DHTMLToolTip(){
	// Configuration settings
	this.AmazonImageServer = "images.amazon.com";	// Server where Amazon images will come from
	this.DefaultBackgroundColor = "#fff";		// Default background color of tool tips
	this.OffsetXPoint = -60;			// X offset of tooltips
	this.OffsetYPoint = 20;				// Y offset of tooltips
	
	// Method declarations
	this.AttachDocumentOnMouseMove = AttachDocumentOnMouseMove;
	this.AttachLinkOnMouseOut = AttachLinkOnMouseOut;
	this.AttachLinkOnMouseOver = AttachLinkOnMouseOver;
	this.AttachWindowOnLoad = AttachWindowOnLoad;
	this.CreateToolTipDiv = CreateToolTipDiv;
	this.GetAmazonImageSource = GetAmazonImageSource;
	this.GetBody = GetBody;
	this.GetPositioningElement = GetPositioningElement;
	this.GetToolTipObject = GetToolTipObject;
	this.HideTip = HideTip;
	this.Initialize = Initialize;
	this.IsToolTipCompatibleBrowser = IsToolTipCompatibleBrowser;
	this.PositionTip = PositionTip;
	this.RewriteAmazonLinksWithTooltips = RewriteAmazonLinksWithTooltips;
	this.ShowAmazonImgTooltip = ShowAmazonImgTooltip;
	this.ShowTip = ShowTip;
	
	// Environment and variables
	this.EnableTip = false;
	this.Initialized = false;
	this.IsIE = false;
	this.IsNS6 = false;
	this.ToolTipObject = null;
	this.ToolTipObjectID = "DDRIVE_dhtmltooltip";
	
	// Adds the tooltip pane with requisite styling;
	// Update styling here as needed.
	function CreateToolTipDiv(){
		var div = document.createElement("div");
		div.id = DHTMLToolTipProvider.ToolTipObjectID;
		div.style.position = 'absolute';
		div.style.width = '150px';
		div.style.border = '3px double black';
		div.style.padding = '2px;';
		div.style.backgroundColor = DHTMLToolTipProvider.DefaultBackgroundColor;
		div.style.visibility = 'hidden';
		div.style.zindex = '100';
		div.style.filter = 'progid:DXImageTransform.Microsoft.Shadow(color=gray,direction=135)';
		DHTMLToolTipProvider.GetBody().appendChild(div);
		return div;
	}
	
	// Attaches an event handler to document.onmousemove
	function AttachDocumentOnMouseMove(func){
		var oldonmm = document.onmousemove;
		if (typeof document.onmousemove != 'function'){
			document.onmousemove = func;
		}
		else {
			document.onmousemove = function(){
				oldonmm();
				func();
			}
		}
	}
	
	// Attaches an event handler to link.onmouseover
	function AttachLinkOnMouseOver(thelink, func){
		var oldonmo = thelink.onmouseover;
		if (typeof thelink.onmouseover != 'function'){
			thelink.onmouseover = func;
		}
		else {
			thelink.onmouseover = function(){
				oldonmo();
				func();
			}
		}
	}
	
	// Attaches an event handler to link.onmouseout
	function AttachLinkOnMouseOut(thelink, func){
		var oldonmo = thelink.onmouseout;
		if (typeof thelink.onmouseout != 'function'){
			thelink.onmouseout = func;
		}
		else {
			thelink.onmouseout = function(){
				oldonmo();
				func();
			}
		}
	}
	
	// Attaches an event handler to window.onload
	function AttachWindowOnLoad(func){
		var oldonload = window.onload;
		if (typeof window.onload != 'function'){
			window.onload = func;
		}
		else {
			window.onload = function(){
				oldonload();
				func();
			}
		}
	}

	// Parses an Amazon referral URL and gets the associated image URL (empty string if N/A)
	function GetAmazonImageSource(amazonUrl){
		var amazonImgSrc = "";
		var AmazonLinkMatches = amazonUrl.match(/^http:\/\/www\.amazon\.[^\/]+\/exec\/obidos\/ASIN\/([\w\d]{10})\/[-\w\d]+$/i);
		if(AmazonLinkMatches && AmazonLinkMatches.length > 1){
			amazonImgSrc = "http://" + DHTMLToolTipProvider.AmazonImageServer + "/images/P/" + AmazonLinkMatches[1] + ".01.MZZZZZZZ.jpg"
		}
		return amazonImgSrc;
	}

	// Gets the body element of the document
	function GetBody(){
		return document.body ? document.body : document.documentElement;
	}
	
	// Gets the element that positions should be calculated from
	function GetPositioningElement(){
		return document.documentElement ? document.documentElement : document.body
	}
	
	// Retrieves the tool tip object from the document
	function GetToolTipObject(){
		if(DHTMLToolTipProvider.IsToolTipCompatibleBrowser()){
			return document.all ? document.all[DHTMLToolTipProvider.ToolTipObjectID] : document.getElementById ? document.getElementById(DHTMLToolTipProvider.ToolTipObjectID) : "";
		}
		return null;
	}

	// Hides the tooltip pane
	function HideTip(e){
		if(DHTMLToolTipProvider.IsToolTipCompatibleBrowser()){
			DHTMLToolTipProvider.EnableTip = false;
			DHTMLToolTipProvider.ToolTipObject.style.visibility = "hidden";
			DHTMLToolTipProvider.ToolTipObject.style.left = "-1000px";
			DHTMLToolTipProvider.ToolTipObject.style.backgroundColor = DHTMLToolTipProvider.DefaultBackgroundColor;
			DHTMLToolTipProvider.ToolTipObject.style.width = '';
		}
	}
	
	// Initializes the tool tip provider
	function Initialize(){
		if(DHTMLToolTipProvider.Initialized){
			return;
		}
		if(document.all){
			DHTMLToolTipProvider.IsIE = true;
		}
		else if(document.getElementById){
			DHTMLToolTipProvider.IsNS6 = true;
		}
		DHTMLToolTipProvider.CreateToolTipDiv();
		DHTMLToolTipProvider.ToolTipObject = DHTMLToolTipProvider.GetToolTipObject();
		DHTMLToolTipProvider.RewriteAmazonLinksWithTooltips();
		DHTMLToolTipProvider.AttachDocumentOnMouseMove(DHTMLToolTipProvider.PositionTip);
		DHTMLToolTipProvider.Initialized = true;
	}
	
	// Determines if the current browser can display the tool tip.
	function IsToolTipCompatibleBrowser(){
		if(DHTMLToolTipProvider.IsIE || DHTMLToolTipProvider.IsNS6){
			return true;
		}
		return false;
	}

	// Positions the tooltip pane
	function PositionTip(e){
		if(DHTMLToolTipProvider.IsToolTipCompatibleBrowser() && DHTMLToolTipProvider.EnableTip){
			var curX = (DHTMLToolTipProvider.IsNS6) ? e.pageX : event.clientX + DHTMLToolTipProvider.GetPositioningElement().scrollLeft;
			var curY = (DHTMLToolTipProvider.IsNS6) ? e.pageY : event.clientY + DHTMLToolTipProvider.GetPositioningElement().scrollTop;

			//Find out how close the mouse is to the corner of the window
			var rightedge = DHTMLToolTipProvider.IsIE && !window.opera ? DHTMLToolTipProvider.GetPositioningElement().clientWidth - event.clientX-DHTMLToolTipProvider.OffsetXPoint : window.innerWidth - e.clientX - DHTMLToolTipProvider.OffsetXPoint - 20;
			var bottomedge = DHTMLToolTipProvider.IsIE && !window.opera ? DHTMLToolTipProvider.GetPositioningElement().clientHeight - event.clientY-DHTMLToolTipProvider.OffsetYPoint : window.innerHeight - e.clientY - DHTMLToolTipProvider.OffsetYPoint - 20;
			var leftedge = (DHTMLToolTipProvider.OffsetXPoint < 0) ? DHTMLToolTipProvider.OffsetXPoint * (-1) : -1000;

			//if the horizontal distance isn't enough to accomodate the width of the context menu
			if (rightedge < DHTMLToolTipProvider.ToolTipObject.offsetWidth){
				//move the horizontal position of the menu to the left by it's width
				DHTMLToolTipProvider.ToolTipObject.style.left = DHTMLToolTipProvider.IsIE ? DHTMLToolTipProvider.GetPositioningElement().scrollLeft + event.clientX - DHTMLToolTipProvider.ToolTipObject.offsetWidth + "px" : window.pageXOffset + e.clientX-DHTMLToolTipProvider.ToolTipObject.offsetWidth + "px";
			}
			else if (curX < leftedge){
				DHTMLToolTipProvider.ToolTipObject.style.left = "5px";
			}
			else{
				//position the horizontal position of the menu where the mouse is positioned
				DHTMLToolTipProvider.ToolTipObject.style.left = curX + DHTMLToolTipProvider.OffsetXPoint + "px";
			}

			//same concept with the vertical position
			if (bottomedge < DHTMLToolTipProvider.ToolTipObject.offsetHeight){
				DHTMLToolTipProvider.ToolTipObject.style.top = DHTMLToolTipProvider.IsIE ? DHTMLToolTipProvider.GetPositioningElement().scrollTop + event.clientY - DHTMLToolTipProvider.ToolTipObject.offsetHeight - DHTMLToolTipProvider.OffsetYPoint + "px" : window.pageYOffset + e.clientY - DHTMLToolTipProvider.ToolTipObject.offsetHeight - DHTMLToolTipProvider.OffsetYPoint + "px";
			}
			else{
				DHTMLToolTipProvider.ToolTipObject.style.top = curY + DHTMLToolTipProvider.OffsetYPoint + "px";
			}
			DHTMLToolTipProvider.ToolTipObject.style.visibility = "visible";		
		}
	}

	// Rewrites the links in the document to provide image tooltips for Amazon referral links
	function RewriteAmazonLinksWithTooltips(){
		for(i = 0; i < document.links.length; i++){
			var amazonImgSrc = DHTMLToolTipProvider.GetAmazonImageSource(document.links[i].href);
			if(amazonImgSrc != ""){
				DHTMLToolTipProvider.AttachLinkOnMouseOver(document.links[i], DHTMLToolTipProvider.ShowAmazonImgTooltip);
				DHTMLToolTipProvider.AttachLinkOnMouseOut(document.links[i], DHTMLToolTipProvider.HideTip);
				// Preload all images
				var imgLoad = new Image();
				imgLoad.src = amazonImgSrc;
			}
		}
	}

	// Shows a tooltip with an Amazon product image in it
	function ShowAmazonImgTooltip(e){
		if (!e) var e = window.event;

		// Get the event target
		var targ;
		if (e.target) targ = e.target;
		else if (e.srcElement) targ = e.srcElement;
		if (targ.nodeType == 3) // defeat Safari bug
			targ = targ.parentNode;

		// We have to act on a link, so go up through the DOM tree until we get one
		var docElement = DHTMLToolTipProvider.GetBody();
		while(targ != docElement && targ.nodeName.toLowerCase() != "a"){
			targ = targ.parentNode;
		}

		// We never got a link
		if(targ == docElement){
			return false;
		}

		// We got a link; show the tooltip
		var imgurl, thecolor, thewidth;
		if (DHTMLToolTipProvider.IsToolTipCompatibleBrowser()){
			var amazonImgSrc = DHTMLToolTipProvider.GetAmazonImageSource(targ.href);
			if(amazonImgSrc != ""){
				var img = new Image();
				img.src = amazonImgSrc;
				DHTMLToolTipProvider.ToolTipObject.innerHTML = '<img src=\'' + img.src + '\'/>';
				DHTMLToolTipProvider.ToolTipObject.style.width = img.width + "px";
				DHTMLToolTipProvider.EnableTip = true;
				return false;
			}
		}
	}
	
	// Shows a tooltip
	function ShowTip(thetext, thecolor, thewidth){
		if(DHTMLToolTipProvider.IsToolTipCompatibleBrowser()){
			if(typeof thewidth != "undefined"){
				DHTMLToolTipProvider.ToolTipObject.style.width = thewidth + "px";
			}
			else{
				DHTMLToolTipProvider.ToolTipObject.style.width = "";
			}
			if (typeof thecolor != "undefined" && thecolor != ""){
				DHTMLToolTipProvider.ToolTipObject.style.backgroundColor = thecolor;
			}
			DHTMLToolTipProvider.ToolTipObject.innerHTML = thetext;
			DHTMLToolTipProvider.EnableTip = true;
			return false;
		}
	}
}

var DHTMLToolTipProvider = new DHTMLToolTip();
DHTMLToolTipProvider.AttachWindowOnLoad(DHTMLToolTipProvider.Initialize);