different behaviour using table tag contains div tag when mask loading grid

[chenwei_022]

hi, all
i find a puzzled problem when my div tag is contained by the table tag.
for example:
<table><tr><td><div id='my-grid'></div></td></tr></table>
the grid mask is different between IE and firefox. see the attached img
how can deal with the IE problem?

[chenwei_022]

[chenwei_022]

[chenwei_022]

,thanks