I`m with some problems...

Thumbnail popup:
IE6: shows the text 'false' - looks wrong
IE6:shows a white BG
FF2: shows image filename underneath
but why as it's too difficult to read
FF2: title tag shows trailing '<br/>' as text
IE6: alt tag shows trailing '<br/>' as text

Lightbox popup:
FF2: good (note title tag as above)
IE6: mouseover shows missing topleft image placeholder
IE6: permanent missing topright image placeholder