The 'sliding door image' effect is described at http://www.phatfusion.net/imagemenu/ along with the files my solution was originally developed from. Also, Wayne Connor used this technique in another Wordpress theme -http://mac-host.com/slidingdoor/ and I learned some more from his support forum, especially http://www.mac-host.com/support/view...php?f=10&t=124
How I used it in Atahualpa
First, you need to obtain the image menu HTML, CSS, and image directory, plus the mootools.js file and load them into your .../themes/atahualpa/ directory in a folder imagemenu/ You can get these from the sites mentioned above, or I have a zipped file that contains a complete imagemenu/ directory similar to what I'm using - you can download at http://highsierradesign.com/library/imagemenu.zip
It's password protected - use: username: monami and password: 4monami
Just unzip and install the folder under altahualpa/ - the imagemenu/images/ directory contains the initial images I used - which you will replace with your own...
Now for Atahualpa itself -
To establish links to the imagemenu specific CSS and mootools, use the Atahualpa administration, go to ATO->Add HTML/CSS Inserts->HTML Inserts: Header and add:
Then, to de-activate the default %image and replace it with the imagemenu, go to ATO->Style & edit HEADER AREA->Configure Header Area and replace the current header specification with:
Finally, to finish cleaning up the header, set:
Show Blog Title? No
Show Blog Tagline? No
That's it - easier to do than describe. It could be done differently, like integrating the imagemenu images in the Atahualpa img/ directory or integrating the imageMenu.css directly into Atahualpa so it could be edited with the Wordpress editor, etc., but for now, I like having all the imagemenu stuff separate and in one place, making it easier to upgrade. Note that none of the core Atahualpa files have been altered manually, so these changes should survive updates automatically.
Hope this makes sense - If anyone has trouble getting this to work - drop me an email.