[MX] Help making video buttons

I am making buttons to control a video in flash and all is working fine except I would like the fast forward button to continue going forward as you hold it. At the moment I have this code:
on(press) {
videoclip.nextFrame();
}

which works fine except I have to keep clicking it to go forward. I thought something like this might work:
onClipEvent (enterFrame){
on(press) {
videoclip.nextFrame();
}
}
But this are syntax errors. If anyone could help I would be very grateful.