Something

mc_clipbox._alpha = 30;
mc_listbox._alpha = 100;



subeClipbox = function(){
//----------sube clipbox
	this.swapDepths(mc_listbox-0);
	
	// listbox transparente
	mc_listbox._alpha = 30;
		onEnterFrame = function() {
		  if (mc_listbox._alpha < 100) {
		  mc_listbox._alpha += 2  // velocidad transicion
   		}
	}
	
	// clipbox opaco
	mc_clipbox._alpha = 30;
		onEnterFrame = function() {
		  if (mc_clipbox._alpha < 100) {
		  mc_clipbox._alpha += 2  // velocidad transicion
		}
	}
		
}

subeListbox = function(){
//----------sube listbox
	this.swapDepths(mc_clipbox-1);
	
	// clipbox transparente
	mc_clipbox._alpha = 30;
		onEnterFrame = function() {
		  if (mc_clipbox._alpha < 100) {
		  mc_clipbox._alpha += 2  // velocidad transicion
   		};
	};
	
	// listbox opaco
	mc_listbox._alpha = 30;
		onEnterFrame = function() {
		  if (mc_listbox._alpha < 100) {
		  mc_listbox._alpha += 2  // velocidad transicion
   		};
	};
}


mc_clipbox.onRollOver = subeClipbox;
mc_listbox.onRollOver = subeListbox;