How to detect when shortcut key is pressed - ATL+F4?

[Huu Loi]

Hi,
This will show you how to:

document.onkeydown = keydown;

function keydown(evt){
  if (!evt) evt = event;
  if ( evt.altKey && evt.keyCode==115){ //CTRL+ALT+F4
    alert("ALT+F4"); 
  }
  else if (evt.shiftKey && evt.keyCode == 9){ //Shif+TAB
    alert("Shift+TAB");
  }
}