mc_listbox.onRollOver = function() {
    mc_listbox.swapDepths(mc_clipbox);
	mc_listbox._alpha = 50;
	mc_clipbox._alpha = 100;
	
}

mc_clipbox.onRollOver = function() {
   mc_clipbox.swapDepths(mc_listbox);
   mc_clipbox._alpha = 50;
   mc_listbox._alpha = 100;
   
}