_dom = document.getElementById?(document.layers?3:2):(document.all?1:0);

photos = new Array(5);
photos[0] = "photo1.jpg";
photos[1] = "photo2.jpg";
photos[2] = "photo3.jpg";
photos[3] = "photo4.jpg";
photos[4] = "photo5.jpg";

function LoadTopVisual(layer) {
	var num=0,rnd=0,visual="";

	rnd = Math.floor(Math.random() * 100);
	num = parseInt(rnd % 5);

	if ( _dom == 2 ) { div = document.getElementById(layer);}
	else if (_dom == 1) { div = document.all[layer];}
	else {div = document.layers[layer];}
	visual = "<a href='/photo/index.php'><img src='imgs/top/" + photos[num] + "' width='480' height='260' border='0' alt='フォトライブラリ'></a>";
	
	div.innerHTML = visual;
}