script to get current page URL and query string parameters

function getQueryStringParameter(paramToRetrieve) {

var currentPageUrl = "";

if (typeof this.href === "undefined") {

    currentPageUrl = document.location.toString().toLowerCase();

}

else {

    currentPageUrl = this.href.toString().toLowerCase();

}

if (currentPageUrl != null) {

        var params =

       document.URL.split("?")[1].split("&");

        var strParams = "";

        for (var i = 0; i < params.length; i = i + 1) {

            var singleParam = params[i].split("=");

            if (singleParam[0] == paramToRetrieve)

                return singleParam[1];

        }

    }

    else {

        return "";

    }

  

}

var pagename=getQueryStringParameter('PageName');