onload = function(){GetcurrentPage();} 
function GetcurrentPage() 
{ 
    if (!document.getElementsByTagName) return; 
    var anchors = document.getElementsByTagName("a"); 
    var locHref = location.href; 
    for (var i=0; i<anchors.length ;i++) 
        if (anchors[i].href==locHref) 
            return anchors[i].id = "current";             
}