// JScript File

function checkEnter(e){ //e is event object passed from function invocation
  var characterCode // literal character code will be stored in this variable

  if(e && e.which){ //if which property of event object is supported (NN4)
    e = e
    characterCode = e.which //character code is contained in NN4's which property
  }
  else{
    e = event
    characterCode = e.keyCode //character code is contained in IE's keyCode property
  }

  return characterCode == 13 // enter key
}