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
        }
    }
}