function onKeyDown()
{
	if ((window.event.ctrlKey)||(window.event.shiftKey)||(event.keyCode==122))
	{
	event.keyCode=0;
	event.returnValue=false;
	}
}
function yxl() { 
if(window.event.altKey) 
{
window.event.returnValue=false;
}
}
document.onkeydown=yxl