[Vertax]

Если я правильно понял, то:

setProportional = function (mc)
{
	coofX = 100 / mc._xscale;
	coofY = 100 / mc._yscale;
	for (var i in mc)
	{
		if (typeof(mc[i]) == "movieclip")
		{
			mc[i]._xscale = 100 * coofX;
			mc[i]._yscale = 100 * coofY;
		}
	}
}