yes not with that setup, you would have to create a directory for each site you want to send it to then set each one up as you did image/banners/ with the logo.php file and all that see it only rotates what in that directory. So the next one would have images/banners2/
Code:
<h3 {background-color:#b0c4de;} <center><a href="www.yourwebsite.com"><img src="images/banners2/logo.php" border="0"></a>
<center/><h3/>