follow up question for CSS (div inserted to table) = raised row height

I was following some great advice from Osgood regarding table cells/image
triggering popup menus. Works great! Thanks so much!

However, when I inserted my div tag into the table cell, then inserted the
image, and then the abs. postitioned div tag for the popup part... my bottom
row seems to have grown tall a fix pixels. (Funny enough this is where I put
the div tags). So now i have space in my table between the bottom rom and
the middle row... trying to get it seemless since the table holds images for
the navbar.

Width wise the table holding all the images perfect with no space between.
Just that last column kinda automatically grew tall.

Any reason? (No cells have a height number either in this row) Just a quirk?
(Also using html for table structure... width 778 -- 4 rows 19 columns)

Thanks to all the DW Veterans!