How do I select a Java Sub Submenu in IE?

I'm trying to "press" a sub submenu in my IE.

MainMenu

SubMenu

SubMenu

<div class="rf-ddm-itm rf-ddm-itm-unsel pd_menuheader pd_item" id="headerForm:menuUsers" onclick="window.location.href = '/views/securitymanagement/users/users.xhtml'"><span class="rf-ddm-itm-ic "><div class="rf-ddm-emptyIcon"></div></span><span class="rf-ddm-itm-lbl ">User</span><script type="text/javascript">new RichFaces.ui.MenuItem("headerForm:menuUsers",{"mode":"client"} );</script></div>

How do I do that?