Methos2, your sig is far too large...
Why don't you simply remove the (rediculus wide) glow and the unneeded alpha transparency in the picture itself, all together (ans save it as a gif).
- Your sig will become a more decent size
- Picture size will be _a lot_ smaller
- Filesize will be _a lot_ smaller
- You wont have any troubles with MSIE compatibility
- You can serioulsy reduce the colors, again reducing filesize even more
- etc...