function random() {
 arrayRandomImages = new Array();
 arrayRandomImages[0] = 'img/pp_1.jpg';
 arrayRandomImages[1] = 'img/pp_2.jpg';
 arrayRandomImages[2] = 'img/pp_3.jpg';
 arrayRandomImages[3] = 'img/pp_4.jpg';
 var rNum = Math.floor(Math.random() * arrayRandomImages.length);
 document.open();
 document.write('<table width="792" height="360" border="0" cellpadding="0" cellspacing="0">');
 document.write('<tr>');
 document.write('<td><img src="' + arrayRandomImages[rNum] + '" width="792" height="360"></td>');
 document.write('</tr>');
 document.write('</table>');
document.close();
}