Thankx Khoshaba for you help. I improved the code a bit but it works great, thanks a lot.
Btn.onRelease = function() {
//If txt text = "1".
if (txt.text == "1") {
//Show the movie on the stage.
attachMovie("01_mc", "01", 4);
tab1._y = 0;
tab1._x = 0;
} else {
(txt.text="00")...