动态绑定div的offsetHeight取值有关问题

<div class="div_peisong_main">            <div class="div_peisong_main1">                <asp:Repeater ID="rep_ps" runat="server">                    <ItemTemplate>                        <dl>                            <dt><a href="#"><img src='<%# "Images/ProPic/"+Eval("ProImg") %>' /></a></dt>                            <dd><a href="#"><%# Eval("PTitle").ToString().Length > 9 ? Eval("PTitle").ToString().Substring(0, 9) : Eval("PTitle")%></a></dd>                        </dl>                    </ItemTemplate>                </asp:Repeater>            </div>            <div class="div_peisong_main2">            </div>        </div>

$(function () {    function load() {        var dome = $(".div_peisong_main");        var dome1 = $(".div_peisong_main1");        var dome2 = $(".div_peisong_main2");        var speed = 1000; //设置向上滚动速度        dome2(dome1());        function moveTop() {            alert(dome1.get(0).offsetHeight);            if (dome2.offset().top - dome.get(0).scrollTop <= 0) {                dome.get(0).scrollTop -= dome1.get(0).offsetHeight;            } else {                dome.get(0).scrollTop++;            }        }        var mymar = setInterval(moveTop, speed);        //鼠标悬浮停止滚动，鼠标离开继续滚动        dome.hover(function () {            clearInterval(mymar);        }, function () {            mymar = setInterval(moveTop, speed);        });    }    window.onload = load;});