How to change MovieClip color on rollover.....

Pretty simple stuff, but for some reason its not working for me.. :(

On layer 2 I have my movie clips loc1, loc2, loc3....etc... inside a movie clip (Inner Main) , and on layer 1 I have a movie clip (click).

Code:-

for (i in mc) {
if (typeof (mc[i]) == "movieclip" && i != "click") {
myBtn = mc[i];
myBtn._alpha = 0;
myBtn.onRollOver = function() {
myBtn._alpha=100;
var colorful = new Color("this");
colorful.setRGB(0x003366);

};
myBtn.onRollOut = function() {
myBtn._alpha=0;
};
myBtn.onPress = function() {

};
};

lost the quotation marks around this

ahh...well it is the 'myBtn' movie clip

i can even write it as:-

var colorful = new Color("myBtn");
colorful.setRGB(0x003366);