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

	  var slider = $('slider');
	  var date = new Date();
	  
	  new Slider(slider, slider.getElement('.knob'), {		
		range: [1900, date.getFullYear()],
		initialStep: 2005,
		onChange: function(value){		  
		  slider.getElement('.label').innerHTML = this.step;
		  $('btn_send').href = "congratulations.html?year="+this.step;
		}
	  });
 

	});