<div id="d1" onmouseout="bb()" style="position:absolute; visibility:hidden; padding-right: 10px; overflow-y: auto; padding-left: 10px; scrollbar-face-color: #ffffff;
                font-size: 11pt; padding-bottom: 0px; scrollbar-highlight-color: #ffffff; overflow: auto;
                width: 255px; scrollbar-shadow-color: #919192; color: blue; scrollbar-3dlight-color: #ffffff;
                line-height: 100%; scrollbar-arrow-color: #919192; padding-top: 0px; scrollbar-track-color: #ffffff;
                font-family: 宋体; scrollbar-darkshadow-color: #ffffff; letter-spacing: 1pt; height: 216px;
                text-align: left; left: 252px; top: 65px;">
                <asp:TreeView ID="TreeView1" runat="server"  style="position:relative; visibility:hidden;"
                     ExpandDepth="2" Width="106px" NodeWrap="True">
                  
                    <SelectedNodeStyle BackColor="Silver" />
                </asp:TreeView>
              
        
                &nbsp;
            </div>
<script>
    function aa()
    {        d1.style.visibility="visible";
       
    }
    function bb()
    {        d1.style.visibility="hidden";
        
    }我现在就是想想控制DIV来控制树的隐藏,显示,可是怎么控制都不行,求大家帮帮忙