// JavaScript Document ( do not works with IE6)
function aKeyWasPressed(e) {
	var evt = e || window.event;
	switch (evt.keyCode) {
		case 39: // Arrow right
			return goto('nav_next');
		case 37: // Arrow left
			return goto('nav_prev');
		case 40: // Arrow down
			// album suivant
			return goto('gal_next');
		case 38: // Arrow up
			// album précédent
			return goto('gal_prev');
	}
	return true;
}

function goto(id) {
	var obj = document.getElementById(id);
	if( obj ) {
		document.location = obj.href;
		return false;	// annule l'evenement par defaut
	}
	return true;
}

if (window.captureEvents) {
	window.captureEvents(Event.KEYPRESS);
	window.onkeypress = aKeyWasPressed;
} else {
	document.onkeypress = aKeyWasPressed;
}