Is there a simpler way of writing this?
function nav(num) {
   gotoAndStop(num);
   }
my_btn1.onRelease = function() {
   nav(1);
}
my_btn2.onRelease = function() {
   nav(2);
}
my_btn3.onRelease = function() {
   nav(3);
}
my_btn4.onRelease = function() {
   nav(4);
}
stop();