The answer to your first question depends upon what type of slideshow you've got. If it is a DHTML (meaning, in this case, it uses HTML, javascript and style) slide show and is actually on the same page, then probably giving the planes a higher z-index will take care of that (from the script, addition red):
Code:
document.write('<img id="si'+i+'" src="'+rndPic+'" style="z-index:100000;position:absolute;top:0px;left:0px">');
If it is a Flash slide show, its wmode param and attribute need to be transparent. For other types of slide shows, there may be no solution.
I have no idea about problems with FF 2, if there really are any, or when they might be addressed if they do exist.
Bookmarks