AS3 - change movie clip color

var rmColorTransform:Color;
var bgColorTransform:Color;

function highlight_pad(mc):void {

bgColorTransform = new Color();
bgColorTransform.setTint(0x666666, 1); //alpha is second parameter
mc.transform.colorTransform = bgColorTransform;

}

function clear_pad(mc):void {

rmColorTransform = new Color();
rmColorTransform.setTint(0xFF0000 , 0); //alpha is second parameter
mc.transform.colorTransform = rmColorTransform;