key event handler that compatible with all browsers using javascript

This might be useful for web developer which wants to have one key event handler that compatible with all browsers.

document.onkeyup = KeyCheck;

function KeyCheck(e)
{
  //this is used for cross browser
  var KeyID = (window.event) ? event.keyCode : e.keyCode;

  switch(KeyID)
   {

   case 13:
    checkPostCodeSelection();
    break;
      }
}