btnImg=new Array();
for(i=0; i<=12; i++) {
	btnImg[i] = new Image();
	btnImg[i].src = "./assets/images/common/navi_"+i+"_on.gif";
}
function imageOn(n){
	document.images['menu'+n].src=btnImg[n].src
}
function imageOff(n){
	document.images['menu'+n].src="./assets/images/common/navi_"+n+".gif";
}
// JavaScript Document