Changing the whole width of Gallary

Hi there,

My site www.easykars.com needs to be changed however cannot find the variable.

I wish to do is sqash the gallery into only half of its width, so that my description of the cars do not hit the end of the screen, then I would like to make a list of names on the right hand side of the screen.

Can someone point me in the right direction?

Thanks

darren