function change_window_picture() {
	
	$("#window-navigation #"+num_picture).removeClass("block");
	$("#window-navigation #"+num_picture).addClass("none");
	
	if(num_picture==nb_picture) {
		num_picture=0;
	}
	
	$("#window-picture ul").stop().animate({
		marginLeft: num_picture*(-960)+"px"
	}, 500);
	
	num_picture++;
	
	$("#window-navigation #"+num_picture).removeClass("none");
	$("#window-navigation #"+num_picture).addClass("block");
	
}


$(document).ready(function() {
	
	<!-- Window picture -->
	nb_picture = $('#picture ul li').length;
	num_picture = 1;
	
	var noeud=document.getElementById("nav").firstChild;
	document.getElementById("nav").removeChild(noeud);
	
	for(p=1; p <= nb_picture; p++) {
		
		var myLI = document.createElement("li");
		myLI.setAttribute("id", p);
		
		if(p==1)
			myLI.setAttribute("class", "block");
		else
			myLI.setAttribute("class", "none");
		
		document.getElementById("nav").appendChild(myLI);
		
	}
	
	timer_window = setInterval("change_window_picture()", 5000);
	$("#window-navigation ul li").click(function() {
												  
		clearInterval(timer_window);
		$("#window-navigation #"+num_picture).removeClass("block");
		$("#window-navigation #"+num_picture).addClass("none");
		
		num_picture=this.id;
		
		$("#window-picture ul").stop().animate({
			marginLeft: (num_picture-1)*(-960)+"px"
		}, 500);
		$("#window-navigation #"+num_picture).removeClass("none");
		$("#window-navigation #"+num_picture).addClass("block");
		timer_window = setInterval("change_window_picture()", 5000);
	});
	
	$("#window-navigation #after").click(function() {
		clearInterval(timer_window);
		$("#window-navigation #"+num_picture).removeClass("block");
		$("#window-navigation #"+num_picture).addClass("none");
		
		num_picture--;

		if(num_picture==0)
			num_picture=nb_picture;
		
		$("#window-picture ul").stop().animate({
			marginLeft: (num_picture-1)*(-960)+"px"
		}, 500);
		$("#window-navigation #"+num_picture).removeClass("none");
		$("#window-navigation #"+num_picture).addClass("block");
		timer_window = setInterval("change_window_picture()", 5000);
	});
	
	$("#window-navigation #later").click(function() {
		clearInterval(timer_window);
		$("#window-navigation #"+num_picture).removeClass("block");
		$("#window-navigation #"+num_picture).addClass("none");
		
		num_picture++;

		if(num_picture>nb_picture)
			num_picture=1;
		
		$("#window-picture ul").stop().animate({
			marginLeft: (num_picture-1)*(-960)+"px"
		}, 500);
		$("#window-navigation #"+num_picture).removeClass("none");
		$("#window-navigation #"+num_picture).addClass("block");
		timer_window = setInterval("change_window_picture()", 5000);
	});
	<!-- END Window picture -->
	
	<!-- Portfolio picture -->
	$("#portfolio ul li").fadeTo(100, 0.5);
	
	$("#portfolio ul li").mouseenter(function() {
		$(this).fadeTo(100, 1);
	});
	
	$("#portfolio ul li").mouseleave(function() {
		$(this).fadeTo(100, 0.5);
	});
	<!-- END Portfolio picture -->

});