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");
                    }
                }
            }
        }
        var divsToHide=[];
        var divs=document.getElementsByTagName("div");
        for(var i=0;i<divs.length;i++){
            var div=divs[i];if(div.className.match(/\bcontent\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(/\bcontent\b/i)){
                if(!contentId)contentId=div.id;div.id="_"+div.id;
            }
        }if(contentId)Tabs.GoTo(contentId,true);
    }
};
FeedbackForm={
    RequestStatus:null,
    RequestStatusText:null,
    Request:null,
    Init:function()
    {
        var span=document.createElement("span");span.className="requestStatus";
        FeedbackForm.RequestStatus=span;var text=document.createTextNode("");
        span.appendChild(text);FeedbackForm.RequestStatusText=text;
        var button=document.getElementById("SubmitFeedback");
        //button.parentNode.appendChild(span);
        var form=document.getElementById("FeedbackForm");
        if(form)form.onsubmit=FeedbackForm.OnSubmitHandler;
    },
    OnRequestEventHandler:function(){
        switch(FeedbackForm.Request.readyState){
            case 4:var d=FeedbackForm.Request.responseText;if(d.substring(0,2)=="OK"){
                FeedbackForm.RequestStatus.style.color="#080";
                document.getElementById("Name").value="";
                document.getElementById("Email").value="";
                document.getElementById("Message").value="";d=d.substring(3);
            }else{
                FeedbackForm.RequestStatus.style.color="#c00";
            }FeedbackForm.RequestStatusText.nodeValue=d;
            document.getElementById("Name").disabled="";
                document.getElementById("Email").disabled="";
                document.getElementById("Message").disabled="";
                document.getElementById("SubmitFeedback").disabled="";break;
        }
    },
    OnSubmitHandler:function(){
        var r=null;if(FeedbackForm.Request){
            r=FeedbackForm.Request;
        }else{
            if(window.XMLHttpRequest){
                try{
                    r=new XMLHttpRequest();
                }catch(e){
                    r=null;
                }
            }if(!r&&window.ActiveXObject){
                try{
                    r=new ActiveXObject("Msxml2.XMLHTTP");
                }catch(e){
                    try{
                        r=new ActiveXObject("Microsoft.XMLHTTP");
                    }catch(e){
                        r=null;
                    }
                }
            }if(!r&&window.createRequest){
                try{
                    r=window.createRequest();
                }catch(e){
                    r=null;
                }
            }FeedbackForm.Request=r;
        }if(!r)return true;document.getElementById("Name").disabled="disabled";
        document.getElementById("Email").disabled="disabled";
        document.getElementById("Message").disabled="disabled";
        document.getElementById("SubmitFeedback").disabled="disabled";
        FeedbackForm.RequestStatus.style.color="#000";
        FeedbackForm.RequestStatusText.nodeValue="Please wait...";r.open("POST","feedback.php?xhr=1",true);
        r.onreadystatechange=FeedbackForm.OnRequestEventHandler;r.setRequestHeader("Content-Type","application/x-www-form-urlencoded");
        r.send("name="+encodeURIComponent(document.getElementById("Name").value)+"&email="+encodeURIComponent(document.getElementById("Email").value)+"&message="+encodeURIComponent(document.getElementById("Message").value));return false;
    }
};
window.onload=function(){
    Tabs.Init();FeedbackForm.Init();
};
var contentId=window.location.hash||"#Introduction";
if(document.createStyleSheet){
    var style=document.createStyleSheet();
    style.addRule("div.content","display: none;");
    style.addRule("div"+contentId,"display: block;");
}else{
    var head=document.getElementsByTagName("head")[0];
    if(head){
        var style=document.createElement("style");
        style.setAttribute("type","text/css");
        style.appendChild(document.createTextNode("div.content { display: none; } div"+contentId+" { display: block; }"));
        head.appendChild(style);
    }
}