function AddUrlParam(url, param)
{        
        if (url.indexOf("?")!=-1)
        {
                var d = param.split("=");
                if( -1!=url.indexOf(d[0]+"=") )
                {
                        var re = new RegExp("("+d[0]+"=([^=]*))","i");
                        url = url.replace(re,param );
                }
                else
                {
                        url += "&" + param;
                }
        }
      else
            url += "?" + param

      return url;
}