This is really difficult for css creator to make tags which move above that flash object. even myself we have seen that its not possible to access (move) any elements above other Tags. Let see the following This.
Image A
Image B
When we try to make “image B” where Flash object is behind the other tag. but its not work easily. even micromedia saying that flash object is different set of layer. so it always getting “image A”. which is really hard for any programmer.
There is one solution to achieve this. All the following line on object tag. and for Firefox user. as object is not their tag. and they are using embed tags show add attribute wmode=”transparent”
<param name=”wmode” value=”transparent”>
Then you will see the things like Image B. and now on your z-index will also work here.