The pics of your gaff?
Image quality is dreadful because you've resized them, but not resized what your webpage is coded to display them at!
Look at this:
http://homepage.ntlworld.com/carlwhittaker/House.html
Say, the bottom picture for convenience.
Now look at this:
http://homepage.ntlworld.com/carlwhi...20-%200020.jpg
You're stretching the image beyond it's parameters.
Of course it's going to look bad.
Resize the image (to I dunno, don't use Irfan - 30-35% say) and then code the page properly to show the proper size. Or resize the image in the table - I presume those are tables on the page you're using.