If you are in OUTLOOK Express...
1.go to tools>>>>

2.options>>>>>

3.signatures tab.

4.At bottom of window you "check" the file option....and then browse for an HTML document that you created. Inside this HTML document (which, by the way, is on "YOUR" had drive) you have code that points to an embeded (or sized .swf) and it shows what ever FLASH/SWISH/HTML signature/picture you want.

I used to have mine like this.....but then I upgraded..to Outlook Express 6...and it doesnt work...Do you know how?