Dear prymus

Indeed that is difficult. Because solpart use some hardcode like &nbsp; and <img  src="spacer.gif" /> for arrows, breadcrumb, before and after the name of a menuitem... And they loooks different in IE and in FF.
First set styles for the rootmenu

Settings	Own Settings	Default settings
menucontainercssclass		MainMenu_MenuContainer
rootmenuitemcssclass	RtMnItNo	No default css class set
rootmenuitemselectedcssclass	RtMnItHo	No default css class set
rootmenuitemactivecssclass	RtMnItAc	No default css class set
rootmenuitembreadcrumbcssclass	RtMnItBr	No default css class set

Second
Set a with for the whole container: for instance: .MainMenu_MenuContainer {width:500px;}
Put this container in another container...
<table>
  <tr>
    <td width="50%">&nbsp;</td>
    <td>[SOLPARTMENU]</td>
    <td width="50%">&nbsp;</td>
   </tr>
</table>

Third
Set for all the rootmenustyles the same width at <td></td> level
That means for instance for the rootmenuitemscssclass: .RtMnItNo td {width: 100px;} 

Fourth
Perhaps you've to remove the arrows and the breadcrumb.

I don't know if this helps. But that's perhaps the way to have a solution. Give me sign if you've found it.

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Vriendelijke groeten
Gilbert Vanden Borre

Dear prymus

Can you sent me the code (just the code of the DNN menu) I'm curious? So that I can see what you've done? mailto: gilbertDOTvandenborreATgivaboDOTnet.

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Vriendelijke groeten
Gilbert Vanden Borre