function on_image(src,id){
	var src=src;
	var id=id;
	src=src.replace("_1","_2");
	document.getElementById(id).src=src;
	}
function out_image(src2,id2){
	var src2=src2;
	var id2=id2;
	src2=src2.replace("_2","_1");
	document.getElementById(id2).src=src2;
	}

function modulo3_affiche_div(b_menu1,b_menu2,b_menu3,b_menu4) {
  var menu1 = document.getElementById("modulo3-menu1");
  var menu2 = document.getElementById("modulo3-menu2");
  var menu3 = document.getElementById("modulo3-menu3");
  var menu4 = document.getElementById("modulo3-menu4");
  if(b_menu1) menu1.style.visibility = "visible";
  else menu1.style.visibility = "hidden";
  if(b_menu2) menu2.style.visibility = "visible";
  else menu2.style.visibility = "hidden";
  if(b_menu3) menu3.style.visibility = "visible";
  else menu3.style.visibility = "hidden";
  if(b_menu4) menu4.style.visibility = "visible";
  else menu4.style.visibility = "hidden";
}