function ShowTab(tabnbr)
{   
    for (var i=1; i < 5; i++)
    {
        document.getElementById('tab' + i).src = "images/learntab" + i + "_off.gif";
        document.getElementById('moreoncontent' + i).style.display = "none";
    }
    document.getElementById('tab' + tabnbr).src = "images/learntab" + tabnbr + "_on.gif";
    document.getElementById('moreoncontent' + tabnbr).style.display = "block";
    return false;
}

function Init()
{
    var querystring = location.toString().toLowerCase().substring(location.toString().indexOf('#') + 1);
    
    var options = new Array(4);
        options[0] = "basics";
        options[1] = "desktopandapp";
        options[2] = "server";
        options[3] = "virtualization";
    
    var tab = 'none'
    for (var i=0; i<options.length; i++)
    {
        if(querystring == options[i]) {tab = querystring;}
    }
    
    if (tab != 'none')
    {
        if (tab == 'basics') {ShowTab(1);}    
        if (tab == 'desktopandapp') {ShowTab(2);}    
        if (tab == 'server') {ShowTab(3); }
        if (tab == 'virtualization') {ShowTab(4); }
    }
    else {ShowTab(1);}
}