function preLoad(imgs) {
	var preImg = new Array();
	for (i = 0; i < imgs.length; i++) {
		preImg[i] = new Image();
		preImg[i].src = imgs[i];
	}
}

preLoad(["img/top-menu01_h.gif","img/top-menu02_h.gif","img/top-menu02_h.gif","img/top-menu03_h.gif","img/top-menu04_h.gif","img/menu01_h.jpg","img/menu02_h.jpg","img/menu03_h.jpg","img/menu04_h.jpg","img/menu05_h.jpg"]);