if (document.images) {
	roll_01_on = new Image();				// Active Images
	roll_01_on.src ="images/layout/museum_mo.gif";
	roll_02_on = new Image();
	roll_02_on.src ="images/layout/about_mo.gif";
	roll_03_on = new Image();
	roll_03_on.src ="images/layout/records_mo.gif";
	roll_04_on = new Image();
	roll_04_on.src ="images/layout/press_mo.gif";
	roll_05_on = new Image();
	roll_05_on.src ="images/layout/staff_mo.gif";
	roll_06_on = new Image();
	roll_06_on.src ="images/layout/store_mo.gif";
	roll_07_on = new Image();
	roll_07_on.src ="images/layout/contact_mo.gif";
	roll_08_on = new Image();
	roll_08_on.src ="images/layout/home_mo.gif";
	


	roll_01_off = new Image();				// Inactive Images
	roll_01_off.src ="images/layout/museum.gif";
	roll_02_off = new Image();
	roll_02_off.src ="images/layout/about.gif";
	roll_03_off = new Image();
	roll_03_off.src ="images/layout/records.gif";
	roll_04_off = new Image();
	roll_04_off.src ="images/layout/press.gif";
	roll_05_off = new Image();
	roll_05_off.src ="images/layout/staff.gif";
	roll_06_off = new Image();
	roll_06_off.src ="images/layout/store.gif";
	roll_07_off = new Image();
	roll_07_off.src ="images/layout/contact.gif";
	roll_08_off = new Image();
	roll_08_off.src ="images/layout/home.gif";
}

// Function to 'activate' images.
function imgOn(imgName) {
	if (document.images) {
		document[imgName].src = eval(imgName + "_on.src");
	}
}

// Function to 'deactivate' images.
function imgOff(imgName) {
	if (document.images) {
		document[imgName].src = eval(imgName + "_off.src");
	}
}