var localUrl = window.location.href;            
var paramIndex = localUrl.indexOf("?WT.mc_id=");
var param;
if(paramIndex != -1) {
    var tparam = localUrl.substring(paramIndex);
    var pIndex = tparam.indexOf("&");
    if(pIndex != -1) {
       param = tparam.substring(0,pIndex);
    }else{
       param = localUrl.substring(paramIndex);
    }
    
}else {
    param = "";
}