如何获取地址栏上的参数名和参数值

    <script language ="javascript" type ="text/javascript" >
    <!--
        var name = new Array;
        var param = new Array;       
        var urlParts = document.URL.split("?");
        var parameterParts = urlParts[1].split("&");
        for (i = 0; i < parameterParts.length; i ++) {
            var pairParts = parameterParts[i].split("=");
             name[i] = pairParts[0];
             param[i] = pairParts[1];
            document.write("参数名称：" + name[i] +"<br>");
            document.write("参数值：" + unescape(param[i])+"<br>" );
        }
     //-->
    </script>