Loop issues

programming flash
1

I’ve got 7 buttons with instance names btn1, btn2, etc. I’ve also got 7 white square movieclips to alpha in over the button when one of the buttons is rolled over. To shorten code I’m using a loop.


for (var i = 1; i <= 7; i++){
	
	 var btn = this["btn"+i];
	 btn.id = i;
	 var mc = this["mc"+i];
	 
     btn.onRelease = function(){
		 trace(this.id);
		 _root.attachMovie("flashemo"+this.id,"fe"+i, i);
	 }
	 btn.onRollOver = function() {
		 mc.alphaTo(70, 0.5, "easeOutQuad", 0);
	 }
	  btn.onRollOut = function() {
		mc.alphaTo(0, 0.5, "easeOutQuad", 0);
	 }
}

But my rollover effect isn’t working. If i replace mc with mc1 or whatever in the code it does work. Any suggestions?