Button got crazy...help!

I'm creating a christmas postcard for a company. At the end of a greeting must appear a button leading to the company website.
But an anoyng problem ocured: the button not working in a postcard.
It's the only button in a file, with the only actionscript.

I've tryed to copy the button simbol & actionscript to another file - it works perfectly. Then I tryed to paste it back to the postcard file, but no use from that. No error message appears. I'm testing movie, clicking on a button & ... nothing happens.

please help me to solve this...christmas won't wait :(((