function   high(which2)   
  {   
  theobject=which2   
  highlighting=setInterval("highlightit(theobject)",10)   //隐现速度(时钟控制,50毫秒一累加)   
  }   
  function   low(which2)   
  {   
  clearInterval(highlighting)   
  which2.filters.alpha.opacity=30   //鼠标移开后的透明度(20%)   
  }   
  function   highlightit(cur2)   
  {   
  if(cur2.filters.alpha.opacity<100)   
  cur2.filters.alpha.opacity+=10   //隐现速度(每50毫秒透明度加5,直到完全不透明)   
  else   if(window.highlighting)   
  clearInterval(highlighting)   
  }