function preload() {
	var img01 = new Image();
	var img02 = new Image();
	var img03 = new Image();
	var img04 = new Image();
	var img05 = new Image();
	img01.src = "/nicmr/common/comimg/nav_rep2.gif";
	img03.src = "/nicmr/common/comimg/nav_dat2.gif";
	img02.src = "/nicmr/common/comimg/nav_pub2.gif";
	img04.src = "/nicmr/common/comimg/nav_res2.gif";
	img05.src = "/nicmr/common/comimg/nav_com2.gif";
}

function ImgChange(imgNum,imgSrc) {
	document.images[imgNum].src = imgSrc;
}