document.onkeydown=key;

function key(evt)
{
	ie4 = (window.navigator.userAgent.indexOf("MSIE")>=1) ? true : false;
	var kc;
	if(ie4)
	{
		kc=event.keyCode;
		if((event.altKey) && (kc==192))
	  {
			document.location.href='Default.aspx?ctl=Login';
	  }
	  if((event.altKey) && (kc==81))
	  {
			document.location.href='Admin/Security/Logoff.aspx';
	  }
	}else{
		kc=evt.which;
		if((evt.altKey) && (kc==192))
	  {
			document.location.href='Default.aspx?ctl=Login';
	  }
	  if((evt.altKey) && (kc==81))
	  {
			document.location.href='Admin/Security/Logoff.aspx';
	  }
	}
	  
}