function gestMenu(vId) {
 //desactiver toutes les pages
 document.getElementById('nous').style.display = 'none';
 document.getElementById('contact').style.display = 'none';
 document.getElementById('reference').style.display = 'none'; 
 //réctiver la page voulu
 document.getElementById(vId).style.display = 'block'; 
 //reactive le bouton menu
 document.getElementById('btn_img_menu').src = 'images/menu.jpg';
 //fermeturedumenu
 Effect.BlindUp('menu',{duration:0.5});
  return false;
}

function lanceMenuSuite() {
	document.getElementById('btn_img_menu').src = 'images/menu_inactif.jpg';
  	document.getElementById('nous').style.display = 'none';
  	document.getElementById('contact').style.display = 'none';
  	document.getElementById('reference').style.display = 'none';
}
function lanceMenu() { 
  if (document.getElementById('menu').style.display == 'none') {
	new Effect.BlindDown('menu',{duration:0.5});
	  	window.setTimeout("lanceMenuSuite()",600);
	//lanceMenuSuite();
  }
}
function slideShow(vId,total,next) {
  var id = vId;
  if (next == 'next') {
	id++;
  }
  else {
    id--;
  }
  if (id == 0) { id = 3; }
  if (id > total) { id = 1; } 
  document.getElementById('slide_' + vId).style.display = 'none';
  document.getElementById('slide_' + id).style.display = 'block';
  document.getElementById('notreid').value = id;
}