window.addEvent('domready', function(){ 
	var totIncrement		= 0;
	var increment			= 300;
	var maxRightIncrement	= increment*(-2);
	var fx = new Fx.Style('relLista','margin-left',{duration: 400, transition: Fx.Transitions.Back.easeInOut, wait: true});
	// EVENTOS boton 'atras'
	if (!e) var e = window.event;
	$('previous').addEvents({'click': function(e){ 
			if(totIncrement<0){
				totIncrement = totIncrement+increment;
				fx.stop()
				fx.start(totIncrement);
			}
		}			  	  
	}); 
	// EVENTOS boton 'siguiente'
	$('next').addEvents({'click': function(e){ 
			if(totIncrement>maxRightIncrement){
				totIncrement = totIncrement-increment;
				fx.stop()
				fx.start(totIncrement);
			}
		}		  		  
	})
			 
});