How to convert .png buttons to .jpeg or .gif files

[DGA15]

I have made navigation buttons using Fireworks,but they are big files, about 30K each. I have 11 buutons, each with an UP, OVER, and Down image, for a total of 33 buttons (~900 B total). They take forever to down load when opening my site.
How can I shrink these to a smaller file size{convert to JPEG, convert to GIF, or other suggestions}?
I have Firewords and Paint installed.
Thanks
dga15

 

[mattygriff]

Export them from Fireworks but specify that you wish to export the images and the HTML.

Then you can cut & paste the FW-generated HTML into your existing web page.