jQuery and onKeyUp

jQuery has the method keyup to take the place of the html attribute onkeyup. So, for example, let's say want to run a javascript function each time escape is pushed. You would do this like so:

$(document).keyup(function(event) {
  if(event.keyCode == 27) { // Capture Esc key
      doSuperSpecialFunction();
  }
});

With this script anytime a key is pressed and goes up in the body of the document, the function specified runs. Simply replace the keyCode number (27, above) with the number that corresponds to your key (like 13 for enter or 8 for backspace). Remember, you must have jQuery "installed" in order for this to work.