How to save GIF's with a transparent background!!

I found this little piece of info and tried it and it worked...thought I would pass along what I've learned!!

Open up your frames in AS make sure you have a transparent background to begin with.
When you are ready to save, go to Save or Save As...whichever you normally do.
Now follow these directions:

Then click Customize in the first screen:
This brings up 3 tabs - Colours, Optimizations and Partial Transparency.

Click the Colors tab.
I have Optimize Median Cut, and Error Diffusion ticked.

Click the Optimizations tab.
I have Write Minimal Frames, Collapse Identical Frames and Map Identical Pixels to Transparent ticked.

Click the Partial Transparency tab.
I tick Convert Pixels less than and generally use 40, but sometimes 100, whichever looks best.
I tick Yes Blend With This Color and choose White.

Then press OK, Next, Next, Next, Finish.