Get parameter value from url

GetParamValue.js

   function getUrlParameter(sParam) {
            var sPageURL = window.location.search.substring(1);
            var sURLVariables = sPageURL.split('&');
            for (var i = 0; i < sURLVariables.length; i++) {
                var sParameterName = sURLVariables[i].split('=');
                if (sParameterName[0] == sParam) {
                    return sParameterName[1];
                }
            }
        }