function preload(imgObj,imgSrc) {
	if (document.images) {
		eval(imgObj+' = new Image()')		
		eval(imgObj+'.src = "'+imgSrc+'"')	
	}
}
//
preload('n_i01','img/navi/n01.gif')
preload('o_i01','img/navi/n01o.gif')
preload('n_i02','img/navi/n02.gif')
preload('o_i02','img/navi/n02o.gif')
preload('n_i03','img/navi/n03.gif')
preload('o_i03','img/navi/n03o.gif')
preload('n_i04','img/navi/n04.gif')
preload('o_i04','img/navi/n04o.gif')
preload('n_i05','img/navi/n05.gif')
preload('o_i05','img/navi/n05o.gif')
preload('n_i06','img/navi/n06.gif')
preload('o_i06','img/navi/n06o.gif')
preload('n_i07','img/navi/n07.gif')
preload('o_i07','img/navi/n07o.gif')
//
function changeImage(imgName,imgObj) {	
	if (document.images) {
		document.images[imgName].src = eval(imgObj+".src")	
	}
}