Comments(0) Cross site scripting can get really ugly. When interacting with a website visitors might try to post script (mostly javascript) which could be harmful.
Comments(0) Apache is a popular server platform which among other things includes an URL rewriting function called mod_rewrite. This function is usually used to rewrite URL:s for documents in order to make them more SEO-friendly.
Actually its pretty obvious that mod_rewrite works for images as well. Among other things, this technique is used for protection against hotlinking (preventing images being shown on external domains). So, why not use mod_rewrite for better looking URL?