var preloadFlag = false;
function preloadImages() {
	if (document.images) {
		pre_nav2_1 = newImage('images/nav2-1.jpg');
		pre_nav3_1 = newImage('images/nav3-1.jpg');
		pre_nav4_1 = newImage('images/nav4-1.jpg');
		pre_nav5_1 = newImage('images/nav5-1.jpg');
		pre_nav6_1 = newImage('images/nav6-1.jpg');
		pre_nav7_1 = newImage('images/nav7-1.jpg');
		pre_nav8_1 = newImage('images/nav8-1.jpg');
		pre_nav9_1 = newImage('images/nav9-1.jpg');
		pre_nav10_1 = newImage('images/nav10-1.jpg');
		pre_nav11_1 = newImage('images/nav11-1.jpg');
		pre_nav12_1 = newImage('images/nav12-1.jpg');
		preloadFlag = true;
	}
}