function yk_get_hotkeyword() {
    var query = ["iPad","\u8c9d\u742a\u5eab\u723e","\u5433\u777f\u7a4e","\u5289\u7fbd\u8b19","\u5442\u5947\u6a3a"];
    return query;
}

var cur_query=null;
function update_element(elm) {
    if(cur_query==null) {
        var query=yk_get_hotkeyword();
        var l=query.length;
        var i=Math.round(Math.random()*1000) % l;
        cur_query=query[i];
    }
    elm.value=cur_query;
}