function SearchTabs(list_id,bg_url,content_id,tab_number) {
  
  var last_index=0,
      items=[],
      default_item;
  
  this.init=function() {
    var list=document.getElementById(list_id);
    items=list.getElementsByTagName("li");
    for (var i=0;i<items.length;i++){
      items[i].index=i;
      addEvent(items[i],"click",eventClick);    //每个Tab的单击事件
      var item_link=items[i].getElementsByTagName("a")[0];
      item_link.onclick=function(){this.blur(); return false; };
    }
    default_item=items[0];
    eventClick.call(default_item);
  }
  
  var eventClick=function() {
    items[last_index].style.fontWeight="normal";
    items[last_index].style.background="";
    this.style.fontWeight="bold";
    this.style.background="url("+bg_url+") center top";
    for(var i=0;i<tab_number;i++){
        var tabElem=document.getElementById(content_id + "_tab_" + i);
        if(i==this.index){
            tabElem.style.display="block";
        }else{
            tabElem.style.display="none";
        }
    }
    last_index=this.index;
  }
}

var setHomepageSearchBox=function(){
    var searchTabs=new SearchTabs("searchTabs","images/searchTabBg.gif","searchContent",5);
    searchTabs.init();
    var quickTabs=new SearchTabs("quickTabs","images/quickTabBg.gif","quickContent",4);
    quickTabs.init();
}