$smileycodes = array(":)", ":(", ";)", ":D",":-/", ":*>", ":P");
for($ctr = 0;$ctr<sizeof($smileycodes); $ctr++) {
$message = str_replace($smileycodes[$ctr],"<img src='smileys/$ctr.gif'>", $message);
}
echo $message;

// image filenames are 0.gif to 6.gif