var imglist = [
	[ "img/top_01.jpg" ] ,
	[ "img/top_02.jpg" ] ,
	[ "img/top_03.jpg" ] ,
	[ "img/top_04.jpg" ] ,
	[ "img/top_05.jpg" ] ,
	[ "img/top_06.jpg" ] ,
	[ "img/top_07.jpg" ] ,
	[ "img/top_08.jpg" ] ,
	[ "img/top_09.jpg" ] ,
	[ "img/top_10.jpg" ] ,
	[ "img/top_11.jpg" ] ,
	[ "img/top_12.jpg" ] ,
	[ "img/top_13.jpg" ] ,
	[ "img/top_14.jpg" ] ,
	[ "img/top_15.jpg" ] ,
	[ "img/top_16.jpg" ] ,
	[ "img/top_17.jpg" ] ,
	[ "img/top_18.jpg" ]
];

function RandomImageLink() {
	var selectnum = Math.floor(Math.random() * imglist.length);
	var output = 
	'<img src="' + imglist[selectnum][0] + '">' +
	'</a>';
	document.write(output);
}