Random Loadmovie

Hi
I am tring to randomly load swf/jpegs in to a movieclip using Loadmovie.
I have tried this.

loader_btn.onPress = function() {
myArray = new Array();
myArray[0] = (loadMovie(“blue.swf”, “loader”));
myArray[1] = (loadMovie(“red.swf”, “loader”));
myArray[2] = (loadMovie(“green.swf”, “loader”));
rNumber = Math.round(Math.random()*3);
myArray[rNumber];

};

but it just keeps loading up blue.swf

Any ideas

Cheers