// IE
if( typeof XMLHttpRequest === "undefined" ){
    XMLHttpRequest = function(){
        return new ActiveXObject(
            navigator.userAgent.indexOf("MSIE 5") > 0 ? "Microsoft.XMLHTTP" : "Msxml2.XMLHTTP"
        );
    }
}

function clicktrack( linkurl,contentID ){
    var contentID = contentID || 0, http = new XMLHttpRequest();
    http.open('GET', 'clicktrack.cfm?url='+linkurl + '&sid=' + Math.random() + "&contentID=" + contentID, false);
    http.send();
}