function display(id) {
	block = document.getElementById(id);
	switch (id) {
		case 'login':
			if (document.getElementById('erreur'))
				document.getElementById('erreur').innerHTML = '';
			document.getElementById('menu_login').style.backgroundImage = 'url(images/menu_actif.jpg)';
			document.getElementById('menu_register').style.backgroundImage = 'url(images/menu.jpg)';
			document.getElementById('menu_recover').style.backgroundImage = 'url(images/menu.jpg)';
			block.style.display = 'block';
			document.getElementById('register').style.display = 'none';
			document.getElementById('recover').style.display = 'none';
		break;
		case 'register':
			if (document.getElementById('erreur'))
				document.getElementById('erreur').innerHTML = '';
			document.getElementById('menu_register').style.backgroundImage = 'url(images/menu_actif.jpg)';
			document.getElementById('menu_login').style.backgroundImage = 'url(images/menu.jpg)';
			document.getElementById('menu_recover').style.backgroundImage = 'url(images/menu.jpg)';
			block.style.display = 'block';
			document.getElementById('login').style.display = 'none';
			document.getElementById('recover').style.display = 'none';
		break;
		case 'recover':
			if (document.getElementById('erreur'))
				document.getElementById('erreur').innerHTML = '';
			document.getElementById('menu_recover').style.backgroundImage = 'url(images/menu_actif.jpg)';
			document.getElementById('menu_login').style.backgroundImage = 'url(images/menu.jpg)';
			document.getElementById('menu_register').style.backgroundImage = 'url(images/menu.jpg)';
			block.style.display = 'block';
			document.getElementById('login').style.display = 'none';
			document.getElementById('register').style.display = 'none';
		break;
		default:
		break;
	}
}

function a_telecharger(user, doc) {
	var url = 'inc/ajax/a_telecharger.php';
	new Ajax.Request(url, {
	  method: 'post',
	  //parameters: 'user='+user+'&doc='+doc,
	  parameters: {user: user, doc: doc},
	  onSuccess: function(xhr) {
		  //maj de la bdd
	  }
	});
}