function rollOn(img_name)
{
	if (document.images)
	{
		image_on = eval(img_name + "_on.src")
		document [img_name].src = image_on
	}
}

function rollOff(img_name)
{
	if (document.images)
	{
		image_off = eval(img_name + "_off.src")
		document [img_name].src = image_off
	}
}

if (document.images)
{
	about_on = new Image()
	about_on.src = "images/nav_about_on.gif"
	about_off = new Image()
	about_off.src = "images/nav_about.gif"

	tour_on = new Image()
	tour_on.src = "images/nav_tour_on.gif"
	tour_off = new Image()
	tour_off.src = "images/nav_tour.gif"

	reservations_on = new Image()
	reservations_on.src = "images/nav_reservations_on.gif"
	reservations_off = new Image()
	reservations_off.src = "images/nav_reservations.gif"

	contact_on = new Image()
	contact_on.src = "images/nav_contact_on.gif"
	contact_off = new Image()
	contact_off.src = "images/nav_contact.gif"
}