// preload images function
function preloadImages() {
	if(document.images) {
		var imgDir = "images/home/";
		// mouse over state
		aboutus1 = new Image; aboutus1.src = imgDir + "home_aboutus_over.gif";
		whytaichi1 = new Image; whytaichi1.src = imgDir + "home_whytaichi_over.gif";
		offer1 = new Image; offer1.src = imgDir + "home_offer_over.gif";
		events1 = new Image; events1.src = imgDir + "home_events_over.gif";
		resources1 = new Image; resources1.src = imgDir + "home_resources_over.gif";
		community1 = new Image; community1.src = imgDir + "home_community_over.gif";
		// mouse out state
		aboutus0 = new Image; aboutus0.src = imgDir + "home_aboutus_sub.gif";
		whytaichi0 = new Image; whytaichi0.src = imgDir + "home_whytaichi_sub.gif";
		offer0 = new Image; offer0.src = imgDir + "home_offer_sub.gif";
		events0 = new Image; events0.src = imgDir + "home_events_sub.gif";
		resources0 = new Image; resources0.src = imgDir + "home_resources_sub.gif";
		community0 = new Image; community0.src = imgDir + "home_community_sub.gif";
	}	
}

// rollover function
function swap(x,y) {
	if(document.images)
		document.images[x].src = eval(y + ".src");
}