function switchTab1()
{
	var oItem = document.getElementById("menu_tr").getElementsByTagName("div");
    for(var i=0; i<oItem.length; i++){
		oItem[i].className = "bj";
	}
    if(tab != "kw") {
      document.getElementById("search").src = "images/search.jpg";
    }else{
      document.getElementById("search").src = "images/11_3.jpg";
    }
    document.getElementById(tab).className = "bj1";
}