Access actions from another level?

I have a meny loading in at _level5. A mc (a teaser) that points to a certain button in the meny system loads in at _level 10 and when this is clicked I need the meny at _level5 to go to meny1, disable “btn4” and colorTo “btn4”. How do I write the code on the mc at _level10 to make this happen?

Here´s the code;

Attach Code

for (var i = 1; i<=8; i++) {
var rfcBtn = _root.undermeny1[“btn”+i];
rfcBtn.ivar = i;
rfcBtn.onRollOver = over;
rfcBtn.onRollOut = out;
rfcBtn.onRelease = function() {
_root.rfcBtnPrev.enabled = true;
_root.rfcBtnPrev.colorTo (0x000000);
this.enabled = false;
_root.rfcBtnPrev = this;
_level0.myMCL.loadClip(“content/gregory/sub”+this.ivar+".swf", 10);
}
}