window.addEvent('domready', function(){
	
	   var mbz_popin_habillage = new MultiBox('mz',{useOverlay: true,showNumbers: false,showControls: false});
	  var mybox_habillage = $('habillage_promo_link'); 
	  $('left_backgroud').addEvent('click',function() { // create your onChange event for the selection box
		
		mbz_popin_habillage.open(mybox_habillage); // call the open function on the multibox object, passing the <a> element to it
	}); 
   $('right_backgroud').addEvent('click',function() { // create your onChange event for the selection box
		
		mbz_popin_habillage.open(mybox_habillage); // call the open function on the multibox object, passing the <a> element to it
	});  	
	
});