死活忘了这个效果叫什么··

http://www.sina.com.cn/
新浪头部那个弹开消失的效果···求指点

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莫非是
.slideDown()
.slideUp()

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dialog?
下拉框？

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 <script type="text/javascript">

       var time = 300;
        var h = 0;
        var T = 300;
        var H = 300;
        window.onload = function() {
            star();
            window.setTimeout("close()", 7000);
        }
        function star() {
            var chang = document.getElementById("showad");
            chang.style.display = "";

            if (time > 0) {
                time--;
                h += 5;

            }
            else return;
            if (h > 300) {
                return;
            }
           chang.style.filter = "Alpha(opacity="+h/2+")";
            chang.style.height = h + "px";
            window.setTimeout("star()", 40);
        }
        function close() {
            var change = document.getElementById("showad");
            if (T > 0) {
                T--;
                H -= 5;
            }
            else return;
            if (H < 0) {
                change.style.display = "none";
            }
            change.style.filter = "Alpha(opacity="+H/2+")";
            change.style.height = H + "px";
            window.setTimeout("close()", 40);
        }
        </script>

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伸缩广告

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如下：

<div id="tmp"><img src="xxxxxxx"></div>





<script>
    $("#tmp").show();
    var time = 200;
    setTimeout(function(){
        $("#tmp").hide(200);
    },time);

</script>