function random_topimage(){
var banner=new Array()

banner[1]="images/top_dark1.jpg"
banner[2]="images/top_daisuke1.jpg"
banner[3]="images/top_daisuke2.jpg"

var ry=Math.floor(Math.random()*banner.length)
if (ry==0)
ry=1
document.write('<img src="'+banner[ry]+'" width="297" height="364" alt="">')}
random_topimage()