You only need basic html really.
We have this in our store and use the following code if you want a tip:
Code:
<table width="155" border="0" cellspacing="0" cellpadding="0" background="/style/ct/images/menu_bg.jpg">
<tr>
<td width="13">[img]/style/ct/images/menu_left.gif[/img]</td>
<td><font class="DialogTitle">Products</font></td>
<td width="15" align="right">[img]/style/ct/images/menu_right.gif[/img]</td>
</tr>
</table