Keeping Layer Mode for animating

Hi…
I wanted to move a layer in animation (In Flash or Gif animation)that has an overlay layer mode effect from Photoshop. I want to preserve this mode but when I save the image as GIF or PNG or JPEG it looses it. HOw can i solve this problem.

make the animated gif in image ready to presearve the layer mode. other than that i guess you could make a copy merged in photoshop, to retain the current look, then just paste the new copy in a new layer.

Copy Merged = Edit/ Copy Merged (or Shift + Ctrl+ c)