event.srcElement+表格应用

  <script language="JavaScript1.2">

  function changeto(highlightcolor){

  source=event.srcElement

  if (source.tagName=="TR"||source.tagName=="TABLE")

  return

  while(source.tagName!="TD")

  source=source.parentElement

  if (source.style.backgroundColor!=highlightcolor&&source.id!="ignore")

  source.style.backgroundColor=highlightcolor

  }

  function changeback(originalcolor){

  if (event.fromElement.contains(event.toElement)||source.contains(event.toElement)||source.id=="ignore")

  return

  if (event.toElement!=source)

  source.style.backgroundColor=originalcolor

  }

  </script>

  <table onMouseOver="changeto('white')" onMouseOut="changeback('#999999')">