function do_search(form)
{
  if( form.elements['p'].value=="" ){
    alert("½Ð¿é¤JÃöÁä¦r!");
    return false;
  }  
  if( form.elements['type'].selectedIndex == 2){
    yid=form.elements['p'].value;
    form.elements['mode'].disabled=true;
    form.elements['catid'].disabled=true;
    form.elements['type'].disabled=true;
    form.elements['p'].disabled=true;
    form.elements['cat'].disabled=true;
    form.action="http://tw.store.bid.yahoo.com/tw/" + encodeURIComponent(yid);
  }
  if( form.elements['type'].selectedIndex == 0){
    form.elements['mode'].disabled=true;
    form.elements['catid'].disabled=true;
    form.elements['type'].disabled=true;
    if( form.elements['catid'].selectedIndex ==0){
      form.elements['cat'].disabled=true;
    }else{
      form.elements['cat'].disabled=false;
    }
    form.action="http://tw.search.bid.yahoo.com/search/store?p="+form.elements['p'].value;
  }
  if( form.elements['type'].selectedIndex == 1){
    form.action="http://tw.store.bid.yahoo.com/tw/search";
  }

  return true;
}
function do_change(){
   if(document.search.elements['type'].selectedIndex == 0){
      document.search.elements['cat'].disabled=false;
      document.search.elements['catid'].disabled=false;
   }else{
      document.search.elements['catid'].selectedIndex=0;
      document.search.elements['catid'].disabled=true;
   }
  document.search.elements['mode'].disabled=false;
  document.search.elements['type'].disabled=false;
  document.search.elements['p'].disabled=false;
  return true;
}
<!-- sh3.ac.tp2.yahoo.com compressed/chunked Sat Nov 21 19:51:16 CST 2009 -->