function nvC(imgname, imgof) {
	if (navigator.appVersion > "3") {
		imgnum = new Image();
		if( imgof == 0 ){
			imgnum.src = "img/nv/n"+imgname+".jpg";
		}else if( imgof == 1 ){
			imgnum.src = "img/nv/n"+imgname+"_on.jpg";
		}
		document.images["n"+imgname].src = imgnum.src;
	}
}

function TopUpperWrite(){

	IMG = 3;	/* ランダム表示 パターン数 */

	num = Math.floor(Math.random() * IMG);
	num += 1;

	ImgNo = (num + "");

	document.write("<div class=\"tmain\" id=\"bg",ImgNo,"\">\n");
}