Pages with images on

[goofyhumor]

I have an existing site that I built over 3 years ago with PHP and MYSQL before I knew how to build search friendly urls using this combination and consequently I have a lot of pages that end like this?car=1.jpg with a different number in. I also have ones like that with?joke=1.txt etc. on at the end. The ones with .txt on are indexed in Google but none of the .jpg ones are but I'm sure they used to be about 18 months ago or so. Is it because Google thinks the ones ending in .jpg are images and not pages?

Problem is that I sometimes use old newsletters which have links in them to these existing pages, so I can't just get rid of the existing urls and replace them, but obviously creating duplicate pages with new urls is not an option either.

I geuss I can probably take the code at the end and redirect to the new page to ensure old newsletters links go to the correct pages but there aren't any duplicate pages.

I was just interested though to know if they're not indexed because Google thinks they are images? One directory that I do not link to in any old newsletters where the pages end in .jpg still gets around 300 plus hits a day so I'm guessing some search engine traffic from other engines finds its way to these pages.