function rollover(objectName) {
	document.getElementById(objectName).src = 'images/' + objectName + 'Invert.png';
$('#graphic').css('background-image', 'url(images/' + objectName + 'Back.png)');
	
}

function rollout(objectName) {
	document.getElementById(objectName).src = 'images/' + objectName + '.png';
	$('#graphic').css('background-image', 'url(images/defaultBack.png)');
}