Pass x_scale and y_scale with Flashvars

I put into html Flash tag this:

<param name="FlashVars" value="arq=../swf/anim.swf&xarq = 48&yarq =48">

First says which flash should be loaded, second and third parameters are x_scale and y_scale.

Into Flash I put this:
-----------------------------
stop();

carregaAnim = function() {
Anim = new LoadVars();
xsize = new LoadVars();
ysize = new LoadVars();
Anim.load(arq);
xsize.load(Number(xarq));
ysize.load(Number(yarq));
}

tela.loadMovie(arq);
tela._xscale = xsize;
tela._yscale = ysize;
tela._y = 0;
tela._x = 0;

System.useCodepage = true;
Stage.showMenu = false;
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I can load the movie without problems but I can´t control x and y scale. I know have to convert to number and I try this, but without results. What do I have to do? What is wrong in my code?

Thanks a lot!