Need help with actionscript animation

greetings everyone…

i need some help with a button… i need a button that when on rollover, that a diferent movie clip goes to certain keyframe and displays a word in a dinamic textbox…

i thought i could at least do the animation part somewhat like this:


on (rollOver) {
    gotoAndPlay(_flech"ini");
}

flech is the movie clip instance which needs to go to that keyframe…
can someone help me do this please?