var dg=!!document.getElementById;
var dl1=!!document.layers;
var id;
var cls;

function stChange(id,cls){
	if(dg){
		document.getElementById(id).className=cls;
	} else {
	}
}

var NvImg=new Array();
for(i=1;i<=12;i++){
NvImg[i]=new Image(); NvImg[i].src="/images/navi_"+i+".gif";
}
function Change(nam,num){
document.images[nam].src=NvImg[num].src;
}

var BtImg=new Array(2); {
BtImg[0]=new Image(); BtImg[0].src="/images/ent_bt1.gif";
BtImg[1]=new Image(); BtImg[1].src="/images/ent_bt2.gif";
}
function ChangeBt(nam,num){
document.images[nam].src=BtImg[num].src;
}