John,
You should be able to so this with only a simple XML file zimlet. See the Salesforce Zimlet for how to add a webpage to a menu:
http://svn.sourceforge.net/viewvc/zi...=1&view=markup
Code:
<zimlet name="com_company_support" version="1.0" description="Support">
<zimletPanelItem label="Support Ticket">
<toolTipText>Right-click to file a support ticket</toolTipText>
<contextMenu>
<menuItem label="Visit Salesforce" id="WWW.SFORCE.COM" icon="SFORCE-panelIcon">
<canvas type="window" title="Support Form" width="640" height="480" />
<actionUrl target="http://www.company.com/support.php">
<param name="referrer">www.zimbra.com</param>
</actionUrl>
</menuItem>
</contextMenu>
</zimletPanelItem>
</zimlet>