if( document.captureEvents && Event.KEYUP ) {
  document.captureEvents( Event.KEYUP );
}
document.onkeyup = alertkey;

function alertkey(e) {
  if(!e ) {
    if( window.event ) {
      e = window.event;
    } else {
      return;
    }
  }
  if( typeof( e.keyCode ) == 'number'  ) {
    e = e.keyCode;
  } else if( typeof( e.which ) == 'number' ) {
    e = e.which;
  } else if( typeof( e.charCode ) == 'number'  ) {
    e = e.charCode;
  } else {
    return;
  }
  if (e == "13" && document.forms[0].loginclicked.value == 1)
	{
		if (ValidateLoginData()) {
			Login();void(0);
		}
	} 
}