var preloadFlag = false;
function preloadImages() {
	if (document.images) {
		pre_menu11 = newImage('images/menu11.gif');
		pre_menu21 = newImage('images/menu21.gif');
		pre_menu31 = newImage('images/menu31.gif');
		pre_menu41 = newImage('images/menu41.gif');
		pre_menu51 = newImage('images/menu51.gif');
		pre_menu61 = newImage('images/menu61.gif');
		pre_menu71 = newImage('images/menu71.gif');
		pre_menu81 = newImage('images/menu81.gif');
		pre_menu91 = newImage('images/menu91.gif');
		preloadFlag = true;
	}
}