// JavaScript Document


	Event.observe(window, 'load', function() {	
										   										   	 
	 	// Gestion de la hauteur d'écran
		centrerSite();
		
		Event.observe(document.onresize ? document : window, "resize", centrerSite);

	});
	
	function centrerSite() {
		var height = document.viewport.getHeight();		
		var total_height = $('principale').getHeight();
		

		if(total_height < height) {
			$('principale').setStyle({ top: '50%', marginTop: '-359px' });
		} else {
			$('principale').setStyle({ top: '0px', marginTop: '0px' }); 
		}
	}