function afficher_loading() {
	document.getElementById('cache').style.display = '';
	document.getElementById('body').style.overflow = 'hidden';
	document.getElementById('page').style.display = 'none';
	//document.getElementById('cache').style.height = document.body.clientHeight;
	//alert( document.body.clientHeight );
	//alert( document.body.innerHeight );
}
function masquer_loading() {
	document.getElementById('cache').style.display = 'none';
	document.getElementById('body').style.overflow = '';
	document.getElementById('page').style.display = '';
}