window.addEvent('domready', function(){ 

	  var totIncrement		= 0;

	  var increment			= 210;

	  var maxRightIncrement	= increment*(-4);

	  var fx = new Fx.Style('slider-list', 'margin-left', {

				duration: 1000,

				transition: Fx.Transitions.Back.easeInOut,

				wait: true

	   });

	   

	   //-------------------------------------

	  // EVENTS for the button "previous"

	  $('previous').addEvents({ 

          'click' : function(event){ 

		  if(totIncrement<0){

					totIncrement = totIncrement+increment;

					fx.stop()

					fx.start(totIncrement);

				}

			}			  	  

      }); 

	 

       //-------------------------------------

	  // EVENTS for the button "next"

  	  $('next').addEvents({ 

          'click' : function(event){ 

			 if(totIncrement>maxRightIncrement){

				 totIncrement = totIncrement-increment;

		    	fx.stop()

				fx.start(totIncrement);

			}

          }		  		  

      })



	 

});