TalkPHP - Image Management

Hi there... I'm currently working on a project where I want to implement an image management tab, whereby the admin member will be given a list of all the images in a particular folder on the site. The next thing I want to do, is have a check box image next to the list to indicate whether or not the image is in use on the site. I was thinking of doing it as follows:

When the user creates the page, and submits, the page content gets scanned for IMG tags, and added to an array, which is then appended to a list of 'in use' images. This method seems a bit archaic to me, however, so I was wondering if there was a more efficient way to go about this?