Collapsible Div

function ToggleCollapsible(ControlIdToShow, SaveStateField, ControlFireID) {
    var control = document.all[ControlIdToShow].style;
    var expandstate = document.all[SaveStateField];

    var ControlFireID = document.getElementById(ControlFireID);

    if (control.display == 'none') {
        control.display = '';
        expandstate.value = 'true';

        if (ControlIdToShow == "ToShow") {
            //showImageID.style.display = "none";
            //hideImageID.style.display = "block";
            //On button click change the image
            ControlFireID.src = "Collapsible/collapse.gif";
            ControlFireID.title = "Hide";
        }
    }
    else {
        control.display = 'none';
        expandstate.value = 'false';

        if (ControlIdToShow == "ToShow") {
            //showImageID.style.display = "block";
            //hideImageID.style.display = "none";
            //On button click change the image
            ControlFireID.src = "Collapsible/expand.gif";
            ControlFireID.title = "Show";
        }
    }

    return false;
}

<input type="hidden" name="CollapsiblePanelHidden" value="True" />
<input id="imgBtnShow" name="imgBtnShow" type="image" src="Collapsible/expand.gif"
onclick="return ToggleCollapsible (&#39;ToShow&#39;, &#39;CollapsiblePanelHidden&#39;, &#39;imgBtnShow&#39;)"
title="Show" style="display: block;" />
<div id="ToShow" style="display: none;">
<table id="ShowTable">
<tr>
<td>
<a id="ShowTableContent"
title="Click to expand/collapse" onclick="return ToggleCollapsible (&#39;PanelToShowOrHide&#39;, &#39;CollapsiblePanelHidden&#39;, &#39;imgBtnShow&#39;, &#39;imgBtnHide&#39;)"
href="#">Collapsible panel (click to expand).</a></td>
</tr>
<tr>
<td id="PanelToShowOrHide" style="width: 100%; display: none; color: Red;">
http://asp-tech.blogspot.com/
</td>
</tr>
</table>
</div>