[eluser]benofsky[/eluser]
Hi, you'll most likely want to create thumbnails from the images you upload take a look at GD: <a href="http://us.php.net/gd">http://us.php.net/gd</a>. GD will let you generate thumbnails I did a quick search and this tutorial might help you too <a href="http://icant.co.uk/articles/phpthumbnails/">http://icant.co.uk/articles/phpthumbnails/</a>.
Good Luck,
Ben