function QueryString(key)
{                  
   var value = null;
   for (var i=0;i<QueryString.keys.length;i++)
   {
     if (QueryString.keys[i]==key)
      {
       value = QueryString.values[i];
       break;
      }
   }
   return value;
}
               
QueryString.keys = new Array();
QueryString.values = new Array();
               
function QueryString_parse()
{
                  
   var query = window.location.search.substring(1);
   var pairs = query.split("&");
                 
   for (var i=0;i<pairs.length;i++)
   {
      var pos = pairs[i].indexOf('=');
      if (pos >= 0)
      {
         var argname = pairs[i].substring(0,pos);
         var value = pairs[i].substring(pos+1);
         QueryString.keys[QueryString.keys.length] = argname;
         QueryString.values[QueryString.values.length] = value;
      }
  }
}
QueryString_parse();
//wywolanie 
//jezeli jest w url parametr p2 to zwraca jego wartosc
//url = QueryString('p2');
//alert(url);