// Preload and name all rollover images

function loadCentImages() {
	centhomeon = new Image();
	centhomeon.src = "http://www.alta.org/about/centennial/button/home-over.gif";
	centhomeoff = new Image();
	centhomeoff.src = "http://www.alta.org/about/centennial/button/home1.gif";
	centdownon = new Image();
	centdownon.src = "http://www.alta.org/about/centennial/button/down-over.gif";
	centdownoff = new Image();
	centdownoff.src = "http://www.alta.org/about/centennial/button/down1.gif";
	centeventon = new Image();
	centeventon.src = "http://www.alta.org/about/centennial/button/event-over.gif";
	centeventoff = new Image();
	centeventoff.src = "http://www.alta.org/about/centennial/button/event1.gif";
	centgbon = new Image();
	centgbon.src = "http://www.alta.org/about/centennial/button/gb-over.gif";
	centgboff = new Image();
	centgboff.src = "http://www.alta.org/about/centennial/button/gb1.gif";
	centhistoryon = new Image();
	centhistoryon.src = "http://www.alta.org/about/centennial/button/history-over.gif";
	centhistoryoff = new Image();
	centhistoryoff.src = "http://www.alta.org/about/centennial/button/history1.gif";
	centocenton = new Image();
	centocenton.src = "http://www.alta.org/about/centennial/button/ocent-over.gif";
	centocentoff = new Image();
	centocentoff.src = "http://www.alta.org/about/centennial/button/ocent1.gif";
}

if (document.images) {
	loadCentImages();
}