Email - hide address

How do I hide my email address from spambots using perhaps Javascript?
I want to put in a button with my email on in within my swf. which when clicked on brings up an email page (which I can do!) but then I don’t know how to hide it from deviant sources. I’ve tried fiddling around in the html but I don’t quite get it.
Please write to me like I’m truly stupid and know nothing!
cheers kath