I am calling an dojo dialog when a button clicked. In that dialog I have an image, when I click that image, the javascript DIV calendar popup (not the dojo calendar) suppose to open. But the thing is that the popup calendar is opening just behind the dojo dialog.

Actually in the IE browser, it works fine. Because I have used the z-index style for that javascript DIV calendar.
But in the Firefox browser the popup calendar open just behind the popup dialog.

any idea...?