[f8]reloading fresh images in the same place

normally this works for me, but i am not getting the correct results...essentially, every time i call loadThumbImages i woudl like to start a new set of images exactly where the old ones were (same starting _x and _y)...any idea why the the next set of thumbs (after a new call) load immediately where the previous set left off??? shouldn't mcHolder be removed and replaced with exactly the same mc?

Code:

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function loadThumbImages(thumbXML) {
        var mcHolder = this.createEmptyMovieClip("mcHolder", 2000);
        root = thumbXML.firstChild.childNodes;
        var nX:Number;
        var nY:Number;
        for (var i = 0; i<=root.length-1; i++) {
                thumbs = root[i].firstChild;
                mcImage = mcHolder.createEmptyMovieClip(i, i);
                createThumbs(thumbs);
        }
}
function createThumbs(thumbs) {
        var mclListener:Object = new Object();
        var mclLoader:MovieClipLoader = new MovieClipLoader();
        mclLoader.addListener(mclListener);

        mclListener.onLoadInit = function(mcClip:MovieClip) {
                nextColumn = mcClip._width+5;
                var newY = 30;
                if (nX == undefined) {
                        nX = 800-(mcClip._width);
                        nY = newY;
                }
                if (nY>=450) {
                        nX -= nextColumn;
                        nY = newY;
                }
                mcClip._x = nX;
                mcClip._y = nY;
                nY += mcClip._height+5;
        };
        mclLoader.loadClip(rootURL+"images/"+galleryID+"/"+galleryID+"-Thumbnails/"+thumbs, mcImage);
}

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try:

Code:

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function createThumbs(thumbs) {
        var mclListener:Object = new Object();
        var mclLoader:MovieClipLoader = new MovieClipLoader();
        mclLoader.addListener(mclListener);
            var nextColumn:Number = 0;
        mclListener.onLoadInit = function(mcClip:MovieClip) {
                nextColumn = mcClip._width+5;
                var newY = 30;
                if (nX == undefined) {
                        nX = 800-(mcClip._width);
                        nY = newY;
                }
                if (nY>=450) {
                        nX -= nextColumn;
                        nY = newY;
                }
                mcClip._x = nX;
                mcClip._y = nY;
                nY += mcClip._height+5;
        };
        mclLoader.loadClip(rootURL+"images/"+galleryID+"/"+galleryID+"-Thumbnails/"+thumbs, mcImage);
}

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