If you just want to use different pictures for toplevel menus, with normal dropdowns, you could do it using the standard Navbar tool.
It requires you to have a group on each layer (OuseOff/MouseOver) consisting of a text and an image/object.
It does not require that you have the text in front, which means that you could just put the text behind the picture and group them. And then softgroup the MouseOff and MouseOver versions. Make one Navbar for each top menu, or make up to 3 pictures in one Navbar by specifying that the first and last are different.
Like shown on the attached image, where I added a second Navbar menu item with a long text that shows up behind the menu image (which is png32 btw).
May save you a lot of ayer fiddling...
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