images = new Array(2);

images[0] = "<a href=\"http://akcijas.lattelecom.lv/455/?lang=lv\" target=\"_top\"><img src="http://datuve.lv/css/1327060712400X400.jpg"></a>";

images[1] = "<a href=\"http://akcijas.lattelecom.lv/455/?lang=lv\" target=\"_top\"><img src="http://datuve.lv/css/1327060712400X400.jpg"></a>";

index = Math.floor(Math.random() * images.length);

document.write(images[index]);