Need Help Creating Image Gallery with slideDown captions

Need Help Creating Image Gallery with slideDown captions

I am new with jQuery and I think I've gone a little too ambitious.

Ideally I would like to click on the #thumbGallery links on the right and load the different images into #photo. That is working. I would like to then also load the different fish .captions(hover slideDown overlay on #photo) and .tips (display at bottom below #photo). Having trouble with selectors writing the right path.

ANY tips or advice would really help.

Also why does the menu drop down( the Produce Reviews one) go behind my fish images? I have z-index on them.

zip of images, .html page, .css, .js and .js library attached

Thanks!
Sara