function doClick(buttonName,e)
    {
        var key;
         if(window.event)
              key = window.event.keyCode;     //IE
         else
              key = e.which;     //firefox  
        if (key == 13)
        {
            var btn = document.getElementById(buttonName);
            if (btn != null)
            { 
                btn.click();
                event.keyCode = 0
            }
        }
   }