var preloadFlag = true;
function preloadImages() {
	if (document.images) {
		nav_01_over = newImage('images/nav_01-over.gif');
		nav_02_over = newImage('images/nav_02-over.gif');
		nav_03_over = newImage('images/nav_03-over.gif');
		nav_04_over = newImage('images/nav_04-over.gif');
		nav_05_over = newImage('images/nav_05-over.gif');
		nav_05_over = newImage('images/nav_07-over.gif');
		preloadFlag = true;
	}
}