<?
srand(time());
$random = (rand()%9);
print("Random number between 0 and 9 is: $random");
?>

when you use .such as you have pictures 0_img.gif to 9_img.gif so

<?
srand(time());
$random = (rand()%9);
echo "<img src="$random_img.gif">";
?>

or you can put in block very easily