One of the expandable ads from my advertising agency causes the search box on my site to disappear when it loads (it's just a plain old <form>...</form> It does return when I rollover the ad to expand it and then close it again, but other than that I can't seem to figure out how it's causing this. I tried z-indexing the search form but that seems to have no impact. It's nowhere near the ad too, but still completely disappears. Weird.
