<img src="<?php
$bannies = array ("ban.jpg","radio.gif","voixoff.gif","ban.ge.jpg",);
$nb_bannies=count($bannies)-1;
echo $bannies[rand(0,$nb_bannies)];
?>"width="360" height="60" border="0" />

<?php

function banniere ()
{
// on définit les bannieres
$bannieres=array();
$bannieres[]=array('1.jpg', 'http://1.com');
$bannieres[]=array('2.jpg', 'http://2.com');

$selection = rand(0, (count($bannieres)-1));

// on retorune un array (image, lien)
$retour = array();
$retour[0] = $bannieres[$selection][0];
$retour[1] = $bannieres[$selection][1];

return $retour;
}

?>

<?php

$pub=banniere();

?>

<a href="<?php echo $pub[1] ?>" title="<?php echo $pub[1] ?>">
<img src="<?php echo $pub[0] ?>" alt="<?php echo $pub[0] ?>" />
</a>