///公告滚动
function announcement(id) {
    var ann_obj =  document.getElementById(id);
    var ann_index = 0;
    var ann_ognHTML = ann_obj.innerHTML;
    var ann_itemHeight = 0;  //ann_obj.parentNode.offsetHeight;
    var ann_li = ann_obj.getElementsByTagName("li");
    var ann_lcount = ann_li.length;
    var ann_run = 1;
    function ann_scroll() {
        var s = ann_obj.scrollTop;
        if (s % ann_itemHeight || ann_run) { ann_obj.scrollTop++; ann_obj.scrollTop %= ann_obj.scrollHeight >> 1; }
        var st = ann_obj.scrollTop % ann_itemHeight ? 10 : 2000;
        setTimeout(function() { ann_scroll(); }, st);
    }

    ann_obj.onmouseover = function() { ann_run = 0; };
    ann_obj.onmouseout = function () { ann_run = 1; };

    //addHandler(window, "load", function () {
        ann_itemHeight += ann_li[0].offsetHeight;
	var style=ann_obj.style;
	style.height= ann_itemHeight + "px";
	style.overflow = "hidden" ;
        ann_obj.innerHTML += ann_ognHTML;
        ann_scroll();
    //});
}