[Reduce the size of a gif image]

Wihout reducing the quality to much I have a gif image (size 233kb) that I want to reduce to around 100kb, can anyone help.

[white showing up as transparent in MapInfo]

Thanks for the ideas, I have tried Boltbait's suggestion and this has worked for me. Because the symbols that i'm inserting a very small the off white colour I have used still looks white. I have attached the image for you to have a look at if your interested, in jpg format.

[white showing up as transparent in MapInfo]

Thanks for the quick reply, I followed the steps you have suggested and for some reason the image is still transparent. White just seems to always show up as transparent.

[white showing up as transparent in MapInfo]

I'm inserting custom symbols into MapInfo, the images for the symbols must be bmp's. I originally used paint to manipulate the image's with white in certain places but when I insert this image in MapInfo it becomes tranparent. I have downloaded a copy of Paint.Net and had a play with this but I'm still getting the same result?

What do I need to do to created a bitmap image where the white doesn't become transparent?