var link = new Array();
 link[0] = '2';
 link[1] = '6';
 link[2] = '8';
 link[3] = '4';
 link[4] = '7';
 link[5] = '9';
 link[6] = '12';
 var rand = Math.floor (Math.random()*link.length); document.write(link[rand]);