AS for E-mail pop up window

Hello folks,
could anyone tell me what is the Action Script for poping up the window which allows a visitor to send me an E-mail directly from my website? What I mean is: when is someone on my website, finds my E-mail address, clicks on it and window pops up allowing him to send me an E-mail. (that window looks kinda like a form. I think it is called mail messenger or something like that) Is it done by Action Script or some other way?
Thanks for any help or input.
Janek