I am trying to export an animation, but got an error.. The code is very simple, the combine function is a little complex:

Export["combin.gif", combine]

Here is the error message:

Rasterize::bigraster: Not enough memory available to rasterize Manipulate expression. 

If try export a swf file

Export["combin.swf", combine]

The error message is

Export::rasterr: An unrecoverable error was encountered when rasterizing. >>

Hoe could I export an animation from mathematic?