this is my code. if i click first time i can show div id named as "surveytooldd" . which is disappear before click. but if i click first it it appears but i want to disapper it on second click.
<div class="tool survey-tool vertical-center color14" onclick="dropdownmenuHeader(this, event, 'surveytooldd');MM_showHideLayers('surveytooldd','','show');MM_showHideLayers('caption','','hide')">
    <img src="" class="vertical-center">
    <span class="caption vertical-center">Survey Tool</span>
</div>
<ul class="survey-tool-drpdwn" style="visibility: hidden;" id="surveytooldd">
    <li class="survey-tool">
        <asp:LinkButton id="aSurveyTool" runat="server" OnClick="aSurveyTool_Click"><span>Survey Tool</span></asp:LinkButton>
    </li>
    <li class="poll-tool">
        <asp:LinkButton id="aPollTool" runat="server" OnClick="aPollTool_Click"><span>Poll Tool</span></asp:LinkButton>
    </li>
    <li class="assessment-tool">
        <asp:LinkButton id="aAssessmentTool" OnClick="aAssessmentTool_Click" runat="server"><span>Assessment Tool</span></asp:LinkButton>
    </li>
</ul>
 
     
     
     
    