How to get the Querystring values using Javascript ?

Using the following Javascript codes we can get the Querystring values.

<script language="javascript" type="text/javascript">

    function GetQueryString(){ 

          var qrStr = window.location.search;

          var spQrStr = qrStr.substring(1);

          var arrQrStr = new Array();

          var arr = spQrStr.split('&');

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

               var queryvalue = arr[i].split('=');

               document.write("Name: "+queryvalue[0]+" Value: "+queryvalue[1]+"<br/>");

          }

}

</script>

Regards,Prajanuranjan....