On my site I added a slide up bar and I am having a issue. You can see some image come over the top of the bar other are under it. Some fonts are under and some are on top. Google ads and form field are going over the top of it. You can see the proxy here. Wait like 5 seconds and slide up will show Hoping this is a css issue but I have a gut feeling its not.
Hmmm.. this may not be a css issue perhaps.. it's kind of hard to tell. Is the slider you have on the bottom js? php? or which one?
I couldn't find the code on your Source for the slider, but if you set it to have a z-index of say 1000 so that it appears over all elements should possibly do the trick.