function PreIMG(){

	pu = new Image();	pu.src = "../img/btn_pagetop.gif";
	pu2 = new Image();	pu2.src = "../img/btn_pagetop2.gif";
	ne = new Image();	ne.src = "../img/btn_nextpage.gif";
	ne2 = new Image();	ne2.src = "../img/btn_nextpage2.gif";
	tp = new Image();	tp.src = "../img/btn_top.gif";
	tp2 = new Image();	tp2.src = "../img/btn_top2.gif";
	ky = new Image();	ky.src = "../img/btn_kyoiku.gif";
	ky2 = new Image();	ky2.src = "../img/btn_kyoiku2.gif";
	j = new Image();	j.src = "../img/icon_jump3.gif";
	j2 = new Image();	j2.src = "../img/icon_jump2.gif";
	j4 = new Image();	j4.src = "../img/icon_jump4.gif";
}

function mv(imageID,imageName) {
	document.images[imageID].src = eval(imageName + ".src");
}