embed images in html

Hi guys, I'm trying to figure out how to create the html portion of a mail with images in. It looks something like this: <img src="cid:image.gif"> and then at the end of the mail: Content-Type: image/gif; name="image.gif" Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename="image.gif" Content-ID: <image.gif> It looks as if all I have to do is encode the image with base64, dump the contents and paste that output into the mail. Is this right? How do I encode an image with base64? Thanks Hans