I have designed some text headings (which are in colour) with a transparent background in fireworks and exported it (gif) to Dreamweaver. That is all good. But when I place the text image (as a background image) in Dreamweaver the text has (in places) white edges which I dont want. Any ideas why this is happening???
The effect that you're experiencing is known as "jaggies". When exporting from Fireworks, you need to set the Matte colour picker to a similar colour to your background.
A better solution, though, would be to use an embedded web font. You can get a lot of free webfonts from www.fontsquirrel.com. Alternatively, if you're using the Creative Cloud, you have access to a lot of TypeKit fonts.