Thank you for your answer to my post. It is awesome that people will volunteer their time to help strangers.
If I read your post correctly, the answer to my question is NO. I cannot have a 350 px wide image that is clickable through Auctiva. I guess I will try to write the code to do this myself.
Here is the mess that I posted to the practice board:
http://www.practiceboard.com/?2706033
I include this link because you requested it, but it seems that pursuing this avenue will be a dead-end if custom-size clickable images aren't allowed.
Thanks again for your kindness.