//Tastatur aus:+<body onMouseDown="return DoFalse();" onKeyPress="return DoFalse();">

function DoFalse(e)
{
 if((document.all && event.ctrlKey == true) || (document.layers && e.modifiers == 2))
 {
  alert('Nicht möglich!'); return false;
 }
}

if(document.layers)
{
 document.captureEvents(Event.KEYPRESS);
 document.onKeyPress = DoFalse;
}

