Button inside Movieclip annoyance

Hi

I have a page with a contact tab, on rollover the tab expands to reveal a hyperlink to an email address and a website. I have put an invisible button over the text but the buttons don’t work! I know this is a common problem and I’v tried adapting advice iv found on tutorial pages and other forums but can’t seem to adapt it to my file.

This is the code I have inside the MC that contains the button…

_root.othercontact_mc.zu_btn.onRelease = function() {
getURL (“mailto: zyzu_1115@126.com”);
}

Please point me in the right direction for a good tutorial or show me where my code is going wrong.

Thanks a lot.