Subscribe to Podcast Script

I've added a Podcast to our site, and using the Drag n Drop method for the XML page works fine, but i'd like to be able to just have a button that says, Click here to subscribe, but i haven't found any examples of what i need to do to get this to work.

Has anyone done this in ASP?

TIA

I'm not quite sure, but can you get a link from Apple/iTunes? I've seen links like phobos.apple.com/WebObjects/MZStore.woa/wa/viewPodcast?id=xxxxx which open iTunes and add the podcast.