image permalinks?

I have some images on my website. some have an absolute url such as:
http://www.sharpfocusphoto.com/business-headshots-on-your-terms/business-headshots_5669/
but others have I would say dynamically created urls:
http://www.sharpfocusphoto.com/?attachment_id=3245
how can I make sure that all my images have an absolute url? thank you for any assistance.