Does anyone know how to send a "multi-part mime message" with CDONTS?

You know like what happens when Outlook Express sends an email in HTML format? If you look at the message source you will see that the message is repeated - once in HTML, once in plain text - so new mail programs read the html version and older ones read the plain text version.

Does anyone know how to do this?

I need it fairly urgently if anyone knows because it's part of a e-christmas card sending asp script to go on my company's website.

Thanks...