Need script to randomly fade mcs?

[Jaffasoft]

I wrote this so far can anyone help with a better way i should have done this:

There is just six mcs on stage with a pic in each and named from 'mc6' though to 'mc11'

chechMc = setInterval(nextMC,500);
fadeturn=true;
myRandomMcs = new Array(6, 7, 8, 9, 10, 11);
function nextMc() {
nextMcToFade = myRandomMcs.splice(random(myRandomMcs.length), 1);
trace(["mc_"+nextMcToFade]);
fadeClips();
if (nextMcToFade.length == isNaN(0)) {
trace("Empty array");
//this is where I need the alternating tricker each time to set fadeturn true or false
myRandomMcs.push(6, 7, 8, 9, 10, 11);
nextMcToFade = myRandomMcs.splice(random(myRandomMcs.length), 1);
}
}
MovieClip.prototype.fadeClips = function() {
this.onEnterFrame = function() {
if (fadeturn=true) {
//do fade up
this["mc_"+nextMcToFade]._alpha += 3;
}
if (fadeturn=false) {
this["mc_"+nextMcToFade]._alpha -= 3;
}
};
};

[cancerinform]

chechMc = setInterval (nextMC, 500);
fadeturn = false;
myRandomMcs = new Array (6, 7, 8, 9, 10, 11);
function nextMc ()
{
    nextMcToFade = myRandomMcs.splice (random (myRandomMcs.length), 1);
    trace (["mc_" + nextMcToFade]);
    var myMc:String = "mc_" + nextMcToFade;
    fadeClips (myMc);
    if (nextMcToFade.length == isNaN (0))
    {
        trace ("Empty array");
        //this is where I need the alternating tricker each time to set fadeturn true or false
        myRandomMcs.push (6, 7, 8, 9, 10, 11);
        nextMcToFade = myRandomMcs.splice (random (myRandomMcs.length), 1);
    }
}
function fadeClips (myMc)
{
    var mc:MovieClip = eval (myMc);
    this.onEnterFrame = function ()
    {
        if (fadeturn == true)
        {
            //do fade up
            mc._alpha += 3;
        }
        if (fadeturn == false)
        {
            mc._alpha -= 3;
            if (mc._alpha <= 0)
            {
                delete this.onEnterFrame;
                nextMc ();
            }
        }
    };
}
nextMc (); 

[Jaffasoft]

Ok you've posted yours and i was just about to post where i was up to. This almost working. Is eval depreciated?

But know it needs to be condensed down but cant work out how??

myRandomMcsUp = new Array(6, 7, 8, 9, 10, 11);
MovieClip.prototype.nextMc = function() {
	nextMcToFade = myRandomMcsUp.splice(random(myRandomMcsUp.length), 1);
	fadeClips();
	if (nextMcToFade.length == isNaN(0)) {
		trace("Finished fading up will now begin fade down");
		myRandomMcsUp.push(6, 7, 8, 9, 10, 11);
		nextMcToFade = myRandomMcsUp.splice(random(myRandomMcsUp.length), 1);
		nextMcDown();
	}
	trace(["mc_"+nextMcToFade]);
};
MovieClip.prototype.fadeClips = function() {
	this.onEnterFrame = function() {
		this["mc_"+nextMcToFade]._alpha += 5;
		if (this["mc_"+nextMcToFade]._alpha>=100) {
			
			nextMc();
		}
	};
};
MovieClip.prototype.nextMcDown = function() {
	nextMcToFade = myRandomMcsUp.splice(random(myRandomMcsUp.length), 1);
	fadeClipsDown();
	if (nextMcToFade.length == isNaN(0)) {
		myRandomMcsUp.push(6, 7, 8, 9, 10, 11);
		nextMcToFade = myRandomMcsUp.splice(random(myRandomMcsUp.length), 1);
		nextMc();
		trace("Finished fading down will now begin fade down");
	}
	trace(["mc_"+nextMcToFade]);
};
MovieClip.prototype.fadeClipsDown = function() {
	this.onEnterFrame = function() {
		this["mc_"+nextMcToFade]._alpha -= 5;
		if (this["mc_"+nextMcToFade]._alpha<=0) {
			nextMcDown();
		}
	};
};

[cancerinform]

I don't know your lower script but you can also change the two lines to this:

var myMc:MovieClip = this["mc_" + nextMcToFade];

var mc:MovieClip = myMc;

if you don't like eval.