function isDefined(property) 
{
  return (typeof property != 'undefined');
}

if (isDefined(window.addEventListener)) 
{
   window.addEventListener('load', gopage, false);
}
else if (isDefined(window.attachEvent)) 
{
   window.attachEvent('onload', gopage);
}

function gopage()
{
    if (isDefined(window.location)) 
    {
    window.location = 'index2.php';
    }

}