I encountered a bug in IE6 where the z-index of <select> elements is always higher than of other elements, regardless of their z-index, i.e. <select> elements always appear on top of everything else. This is a problem for PMA because the tooltip feature becomes blocked and you can't read the text inside:

The fix for this is to position an iframe directly on top of every single <select> element to just cover it, though it's really just an hack. 

I'm wondering if it's even necessary to continue supporting IE6. (Google stopped supporting it for YouTube...)

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Thanks,
Lori