Any ideas how to change this?

So below this is the script to run the swf on its own. So this work perfectly.
Now i wanted it to be loaded into the main swf inside of some movieclips.
According to other loaded swf to the min swf,i need
:var _l1=_root.slide.test6

so my problem is where to input the “_l1” variable? seems like changing all the “this” to “_l1” and at “_l1” infront of “btn” and “mc” is not enough. can someone help please?

code:
MovieClip.prototype.fadeIn = function(minAlpha, maxAlpha, speed) {

this._alpha = minAlpha;
this.trigger = true;

this.onEnterFrame = function() {
	this._alpha += speed;
	if (this._alpha>=maxAlpha) {
		this._alpha = maxAlpha;
		
		this.trigger = false;
		
	}
};

};
MovieClip.prototype.fadeOut = function(minAlpha, maxAlpha, speed, clip) {

this.onEnterFrame = function() {
	this._alpha -= speed;
	if (this._alpha<=minAlpha) {
		this._alpha = minAlpha;
		this.trigger = false;
		clip._visible = false;
	}
};

};
function afterRO(cur) {

cur.fadeIn(0, 100, 10);
cur._visible = true;
cur.onRollOut = function() {
	cur.fadeOut(0, 100, 15, cur);
};

}
btn1.onRollOver = function() {
afterRO(mc1);
};
btn2.onRollOver = function() {
afterRO(mc2);
};
btn3.onRollOver = function() {
afterRO(mc3);
};