img = new Array();
img[0]="images/img_mine01.jpg";
img[1]="images/img_mine02.jpg";
img[2]="images/img_mine03.jpg";
img[3]="images/img_mine04.jpg";
img[4]="images/img_mine05.jpg";
img[5]="images/img_mine06.jpg";
img[6]="images/img_mine07.jpg";
img[7]="images/img_mine08.jpg";
img[8]="images/img_mine09.jpg";
img[9]="images/img_mine10.jpg";
img[10]="images/img_mine11.jpg";
img[11]="images/img_mine12.jpg";
n = Math.floor(Math.random()*img.length);
document.write("<img src='"+img[n]+"' border='0'>");