TteeView在runat="server"时防止滚动条自动滚到初始位置

<div id="TreeDiv" style="width: 226px; height: 460px; overflow: auto;">
<asp:TreeView ID="CtrlTree" runat="server" ShowLines="True" Width="90%" ExpandDepth="0"
EnableClientScript="False" PopulateNodesFromClient="False" OnTreeNodePopulate="CtrlTree_TreeNodePopulate">
<SelectedNodeStyle CssClass="TreeSelect" Font-Bold="True" />
<NodeStyle ImageUrl="~/Images/TreeTop/Cert.gif" />
</asp:TreeView>
</div>

<script language="javascript">
var sFirstEnter = 1;

// 获取当前文件名
function getFileName()
{
var url = this.location.href;
var pos = url.lastIndexOf("/");
if(pos == -1)
pos = url.lastIndexOf("//");
var filename = url.substr(pos+1);
return filename;
}

function fnLoad()
{
with(window.document.all.TreeDiv)
{
try
{
addBehavior ("#default#userData"); // 使得body元素可以支持userdate
load("scrollState" + getFileName()); // 获取以前保存在userdate中的状态
//alert(getAttribute("scrollLeft"));
//if (sFirstEnter=="0")
//{
scrollLeft = getAttribute("scrollLeft"); // 滚动条左位置
scrollTop = getAttribute("scrollTop");
//}
}
catch(e)
{
//alert(e);
};
}
}
function fnUnload()
{
with(window.document.all.TreeDiv)
{
try
{
setAttribute("scrollLeft",scrollLeft);
setAttribute("scrollTop",scrollTop);
save("scrollState" + getFileName());
}
catch(e)
{
//alert(e);
};
}
}

window.onload = fnLoad;
window.onunload = fnUnload;
</script>