Newbie here - buttons work on stage, not when i test in explorer?

SO i am new to flash - i made some rollover buttons that work in the stage (when i click in ‘enable simple buttons’) but when i hit CRTL+ENTER to test, the buttons dont work at all - these buttons have text in them - could that be the problem?

This seems like such a simple thing to do, but its not working - any ideas?

Thanks for helping a newbie!