Does anyone know why, when I place an image width and height in pixels in my CSS, FP wants to go and add them back into the page code when i've deleted them already?
Because FP has an ego the size of a house. I always leave my image sizes in the XHTML. If you have more than one image on a page you just end up putting loads of styles in your css.
It was for a series of thumbnails of some templates i've created, and in time there'll be lots of them I hope. So it wasn't just a one off image, but I guess if I can't change it then i just can't.