function getURLParam(paramName) {
    var paramValue = null;
    var url = window.location.href;
    if (url.indexOf("?") > -1) {
        var params = url.substr(url.indexOf("?")); //Casesensitive
        var singleParam = params.split("&");
        for (var i = 0; i < singleParam.length; i++) {
            if (singleParam[i].indexOf(paramName + "=") > -1) {
                var param = singleParam[i].split("=");
                paramValue = param[1];
                break;
            }
        }
    }
    return paramValue;
}