img1=new Array(5);
img1[0]="<img border='0' src='top/head.gif' width='870' height='34'>";
img1[1]="<img border='0' src='top/head2.gif' width='870' height='34'>";
img1[2]="<img border='0' src='top/head3.gif' width='870' height='34'>";
img1[3]="<img border='0' src='top/head4.gif' width='870' height='34'>";
img1[4]="<img border='0' src='top/head1.gif' width='870' height='34'>";
img1No=Math.floor(5*Math.random());
document.write(img1[img1No]);