img = new Array();
img[0] = "img/topgallery/img0.jpg";
img[1] = "img/topgallery/img1.jpg";
img[2] = "img/topgallery/img2.jpg";
img[3] = "img/topgallery/img3.jpg";
img[4] = "img/topgallery/img4.jpg";
img[5] = "img/topgallery/img5.jpg";
n = Math.floor(Math.random()*img.length);
document.write("<img src='"+img[n]+"' border='0'>");