Actionscript on my button problem

Hi guys, i want to dynamically load a movie, i have this ac on the button

on (release) {

I have created a mask and a content mc, and named the content mc content, but when i click on the button nothing happens, i don’t know why, theres probably a problem with the action script i am using, also i want a mc with an instance name ‘def’ to disappear once the button is clicked on, how do i code for this. Any help would be appreciated, thanks!