<?php
$target = "_blank";
$border = "0"; 

$link['1'] = "http://www.pijaca.ba";
$banner['1'] = "http://www.pijaca.ba/baneri/pijaca_120_60.gif"; 

$link['2'] = "http://www.programeri.com/";
$banner['2'] = "http://www.baner_sa_programera.jpg"; 

$banners = count($banner);
$links   = count($link);
$x       = rand(1, $banners); 

    echo('<a href="'.$link[$x].'" target="'.$target.'"><img src="'.$banner[$x].'" border="'.$border.'"></a>');
?>

Ovaj kod koristim u desnom donjem cosku. Vrlo jednostavno za rotiranje bannera bez mySQL bazepodataka.