var img=new Array();
img[img.length]="randomimg/image002.png";
img[img.length]="randomimg/image003.png";
img[img.length]="randomimg/image004.png";
img[img.length]="randomimg/image005.png";
img[img.length]="randomimg/image006.png";
img[img.length]="randomimg/image007.png";
img[img.length]="randomimg/image008.png";
img[img.length]="randomimg/image009.png";
img[img.length]="randomimg/image010.png";
img[img.length]="randomimg/image011.png";
img[img.length]="randomimg/image012.png";
img[img.length]="randomimg/image013.png";

var rand=Math.round(Math.random()*(img.length-1));

document.write("<img src='" + img[rand] + "' border='0' />");