Resize and math, need help, please

Hello everyone,

I´m working with the resize image gallery, eveything works fine but I have my border mc registration point on the bottom left. I just can not figure out how to position the container mc the right way

here´s the code

 function preload(target) {
    _root.onEnterFrame = function() {
        var t = target.getBytesTotal(), l = target.getBytesLoaded();
        per = Math.round((l/t)*100);
        if (l == t && target._width>0 && target._height>0) {
            var w = target._width+space, h = target._height+space;
            resizeMe(w, h);
            delete this.onEnterFrame;
        } else {
            picinfo.text = per;
        }
    };
}
function resizeMe(w, h) {
    conteudo.boder.tween(["_width", "_height"], [w, h], 1, "easeOutSine");
    conteudo.images_mc.alphaTo(100, 1, "easeOutSine");
    imagesPath.depths_mc._x = conteudo.boder._x+conteudo.boder._width/2+space/2;
    imagesPath.depths_mc._y = conteudo.boder._y+conteudo.boder._height/2+space/2;
}

I am not sure if it´s relevant but the complete path to the images is imagesPath.depths_mc.one_mc.img_mc
imagesPath.depths_mc.two_mc.img_mc
imagesPath.depths_mc.three_mc.img_mc

I am loadind the images in 3 diferents mc´s then using swap dephts to exibth the right one

many thanks