var preloadFlag = false;
function preloadImages() {
	if (document.images) {
		pre_meyasu1 = newImage('img/meyasu1.gif');
		pre_link1 = newImage('img/link1.gif');
		pre_setu1 = newImage('img/setu1.gif');
		pre_li1 = newImage('img/li1.gif');
		pre_meyasu2 = newImage('img/meyasu2.gif');
		pre_link2 = newImage('img/link2.gif');
		pre_li2 = newImage('img/li2.gif');
		pre_setu2 = newImage('img/setu2.gif');
		pre_go1 = newImage('img2/go1.gif');
		pre_go2 = newImage('img2/go2.gif');
		preloadFlag = true;
	}
}