function getParamValue (sURL, Param, Default)  
    {
         //  Extracts and returns the parameter value from the URL for the specified parameter.
         //  If the parameter does not occur is the URL, the default value is returned.
         //  This function is not Case-sensitive.
         var sURLUpper = sURL.toUpperCase() + "&";
         Param = Param.toUpperCase();
         if (!Default) Default="";
     
         var Pos = sURLUpper.indexOf (Param + "=" );
         if (Pos==-1) return Default;
         Pos = Pos + Param.length + 1;
         return sURL.substring (Pos, sURLUpper.indexOf("&", Pos));
    }

function GetParam(name)
{
  var start=location.search.indexOf("?"+name+"=" );
  if (start<0) start=location.search.indexOf("&"+name+"=" );
  if (start<0) return '';
  start += name.length+2;
  var end=location.search.indexOf("&",start)-1;
  if (end<0) end=location.search.length;
  var result=location.search.substring(start,end);
  var result='';
  for(var i=start;i<=end;i++) {
    var c=location.search.charAt(i);
    result=result+(c=='+'?' ':c);
  }
  return unescape(result);
}