onEnterFrame and onRollOver Problem

programming flash
1

I am using two commands to run a function in the first frame of my movie…code below…however, the Rollover and RollOut are not working, just the onEnterFrame…if i take out the onEnterFrame they work fine and If i change the onEnterFrame to onLoad they both work fine, but i need to use the onEnterFrame …is there a way around this? Can i just set a on(rollover) in my button? if so, how do i setup that code?

tbutton.onEnterFrame = function() {
snder(“snd”, true);
}
_root.tvb.onRollOver = function() {
snder(“tradi”, true);
}
_root.tvb.onRollOut = function() {
snder(“snd”, true);
}