Google search problem

I’ve just developed a site for a client who for reasons unknown to me, passed it on to another developer for “optimizing”.

Now, when certain keywords are Googled it leads to URL’s like this http://www.c9designs.co.uk/viewsubgallery.php?s=80&np=6&id=72&display=Mansfield&cat=Places&sub=Mansfield

The whole site was working perfectly until the “optimizing” and now I’m getting the blame for this rogue URL.

Any help on how to fix this?

Thanks in advance