// JavaScript Document

function headerImg(){
	img = new Array();
	img[0] = "header_logo.gif";
	img[1] = "header_logo2.gif";
	img[2] = "header_logo3.gif";
	n = Math.floor(Math.random()*img.length);
	document.write('<img name="header_logo" src="http://www.1000rioka.net/images/'+img[n]+'" border="0" id="header_logo" alt="千里丘ネット" />');
}