function random(){

img = new Array();
img[0] = "images/hn_1.jpg";
img[1] = "images/hn_2.jpg";
img[2] = "images/hn_3.jpg";
img[3] = "images/hn_4.jpg";
img[4] = "images/hn_5.jpg";
img[5] = "images/hn_6.jpg";
img[6] = "images/hn_7.jpg";
//img[7] = "images/hn_8.jpg";
img[7] = "images/hn_9.jpg";
img[8] = "images/hn_10.jpg";
img[9] = "images/hn_11.jpg";
img[10] = "images/hn_12.jpg";
img[11] = "images/hn_13.jpg";
img[12] = "images/hn_14.jpg";
img[13] = "images/hn_15.jpg";
img[14] = "images/hn_16.jpg";
img[15] = "images/hn_17.jpg";

for (i=0 ; i<img.length; i++){
	var tmpA, tmpB, rnd;
	rnd=Math.floor(Math.random() * img.length);
	tmpA=img[i];
	tmpB=img[rnd];
	img[i]=tmpB;
	img[rnd]=tmpA;
}


n = Math.floor(Math.random()*img.length);
document.write("<img src='"+img[n]+"' border='0'>");

}
	<!--
	
	//ウィンドウオープン
	var Newwin=null;
	function movie_open(w,h,s_data){
			ww=w.substring(0,w.length);
			hh=h.substring(0,h.length);
			ss_data = s_data;
			setTimeout('go_s(ww,hh,ss_data)',1000);
	}
	function go_s(wi,he,s_data) {
			Newwin = window.open(s_data, "ra_win", "toolbar=0,location=0,directories=0,status=0,menubar=0,scrollbars=1,resizable=0,copyhistory=0,width="+wi+",height="+he);
	}
	
	
	//-->