function doDocumentOnMouseOver() {
    var eSrc = window.event.srcElement ;
    if (eSrc.className == "item") {
      window.event.srcElement.className = "highlight";
    }
  }

  function doDocumentOnMouseOut() {
    var eSrc = window.event.srcElement ;
    if (eSrc.className == "highlight") {
      window.event.srcElement.className = "item";
    }
  }