Show xml loaded thumbs in two or more lines

Hi again,

Im loading image thumbs from an XML file. Currently my code loads all the images in one line. can i somehow break this up so for example if i have 12 images, they show up in three rows, with four thumbs in each row.

thanx
-Britney


//loadMovie(""+cell_path+"", "_root.cellphone_big");
myWalls = new XML();
myWalls.ignoreWhite = true;
myWalls.onLoad = function(success) {
    numimages = this.firstChild.childNodes.length;
    spacing = 90;
    for (i=0; i<numimages; i++) {
        this.picHolder = this.firstChild.childNodes*;
        this.thumbHolder = thumbnails.createEmptyMovieClip("thumbnail"+i, i);
        this.thumbHolder._x = i*spacing;
        this.thumbLoader =   this.thumbHolder.createEmptyMovieClip("thumbnail_image", 0);
        this.thumbLoader.loadMovie(this.picHolder.attributes.thmb);
        this.thumbHolder.title = this.picHolder.attributes.title;
        this.thumbHolder.main = this.picHolder.attributes.main;
        this.picHolder._width=50;
        this.picHolder._height=50;
        this.thumbHolder.onRelease = function() {
            contentID = this.main;
            loadMovie(""+contentID+"", "_root.cellphone_big");
            Link = "displayVar.asp?location=" + contentID;
            getURL(Link, "_self", "POST"); //passing image path to a page
            title_txt.text = this.title;
        };
    }
};
myWalls.load("xml/wallpapers.xml");