$(document).ready(function(){
	$("#accendi").click(function() {
		  $(".page").css("opacity","1.0");
		  $("body,html").css("background","white");		  
		  $(".page").css("filter","alpha(opacity=100)");
		  $(this).css("display","none");
		  $("#spegni").css("display","block");
		});

	$("#spegni").click(function() {
		  $(".page").css("opacity","0.7");
		  $("body,html").css("background","white");		  
		  $(".page").css("filter","alpha(opacity=75)");
		  $(this).css("display","none");
		  $("#accendi").css("display","block");
		});	
});