Setting the movieclip property ._visible to false

1

Hi,
I used the following code to read a file “images.txt” and build a movieclip by loading the images specified in the file.

I wanted to make this dyanmicaly built movieclip invisibe.
i.e “setProperty (_root.preloader[‘part’+count], _visible, false);”
line in my code below is not working.

Please help
Thanks,
sharvan

[AS]
var count = 0;
var offset = 0;
_root.createEmptyMovieClip(‘preloader’, 10);

function BuildMovie() {

    for ( count =0; count <= (images.length -1); count ++)
    {
            _root.preloader.createEmptyMovieClip('part'+count,count);
            _root.preloader['part'+count].loadmovie(images[count]);
            
            setProperty (_root.preloader['part'+count], _x, 20+offset);
            setProperty (_root.preloader['part'+count], _y, 20);
            setProperty (_root.preloader['part'+count], _visible, false);
            
            offset = offset + 200;
    }

}

//
//
m = new LoadVars();
m.onLoad = function(ok) {
if (ok) {
images = this.Images.split("|");
Trace(images.length);
Buildmovie();
}
};
m.load(‘images.txt’, this);

[/AS]