CSS={
	AddClass:function(e,c)
		{
		if(!e.className.match(new RegExp("\\b"+c+"\\b","i")))e.className+=(e.className?" ":"")+c;
		},RemoveClass:function(e,c)
			{
			e.className=e.className.replace(new RegExp(" \\b"+c+"\\b|\\b"+c+"\\b ?","gi"),"");
			}
		};
		
Tabs= 
	{
	GoTo:function(contentId,skipReplace)
		{
			var foundTab=false;
			var toc=document.getElementById("toc");
			if(toc)
				{
				var lis=toc.getElementsByTagName("li");
				for(var j=0;j<lis.length;j++)
					{
					var li=lis[j];
					var anchors=li.getElementsByTagName("a");
					for(var k=0;k<anchors.length;k++)
						{
							if(anchors[k].hash=="#"+contentId)
								{
								CSS.AddClass(li,"current");
								foundTab=true;
								break;
								}
							else
								{
								CSS.RemoveClass(li,"current");
								}
						}
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				}
			var divsToHide=[];
			var divs=document.getElementsByTagName("div");
			for(var i=0;i<divs.length;i++)
				{
				var div=divs[i];
				if(div.className.match(/\btcontent\b/i))
					{
					if(div.id=="_"+contentId)div.style.display="block";
					else divsToHide.push(div);
					}
				}
			for(var i=0;i<divsToHide.length;i++)
			divsToHide[i].style.display="none";
			if(!skipReplace)window.location.replace("#"+contentId);
		},OnClickHandler:function(e)
			{
			if(!e)e=window.event;
			if(e.preventDefault)e.preventDefault();
			else e.returnValue=false;
			Tabs.GoTo(this.hash.substring(1));
			},Init:function()
				{
				if(!document.getElementsByTagName)return;
				var anchors=document.getElementsByTagName("a");
				for(var i=0;i<anchors.length;i++)
					{
					var a=anchors[i];
					if(a.hash)a.onclick=Tabs.OnClickHandler;
					}
				var contentId;
				if(window.location.hash)
				contentId=window.location.hash.substring(1);
				var divs=document.getElementsByTagName("div");
				for(var i=0;i<divs.length;i++)
					{
					var div=divs[i];
					if(div.className.match(/\btcontent\b/i))
						{
						if(!contentId)contentId=div.id;
						div.id="_"+div.id;
						}
					}
				if(contentId)Tabs.GoTo(contentId,true);
				}
		};
	
	
			window.onload=function(){Tabs.Init();
																										
					};

					var contentId=window.location.hash||"#Introduction";
					if(document.createStyleSheet){var style=document.createStyleSheet();
						style.addRule("div.tcontent","display: none;");
						style.addRule("div"+contentId,"display: block;");
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					else{
						var head=document.getElementsByTagName("head")[0];
					if(head)
						{
						var style=document.createElement("style");
							style.setAttribute("type","text/css");
							style.appendChild(document.createTextNode("div.tcontent { display: none; } div"+contentId+" { display: block; }"));
							head.appendChild(style);
						}
					}