// Handles menu roll overs for site navigation

// Handles rollover of menu images
// button: the image element to change
// add_image: the image to change button to
function toggle( button, add_image )
{
	if( (add_image != null) && (button != null) )
	{
		button.src = 'resources/images/' + add_image;
	}
}

// Preloads hidden rollover images
// Should be called onload.
function preload_images()
{
	if( (document.images != null) )
	{
		var pic1 = new Image(140,22);
		var pic2 = new Image(140,22);
		var pic3 = new Image(140,22);
		
		pic1.src = 'resources/images/aitc_home_over.png';
		pic2.src = 'resources/images/aitc_services_over.png';
		pic3.src = 'resources/images/aitc_contact_over.png';
	}
}