function randomimage() {
	var imglist = new Array(
	"1.jpg",
	"2.jpg",
	"3.jpg",
	"4.jpg",
	"5.jpg",
	"6.jpg",
	"7.jpg",
	"8.jpg",
	"9.jpg",
	"10.jpg",
	"11.jpg"
	);
	var foldername = "./topimage/";
	var selectnum = Math.floor((Math.random() * 100)) % imglist.length;
	var output = '<img src="' + foldername + imglist[selectnum] + '" width="760" height="300"><br>';
	document.write(output);
}