Hi Tony,
The problem seems to occur mainly in Chrome. Attached is a screen grab that I've just done with Chrome on the left and Safari on the right. Same width of window for each browser but the image doesn't rescale in Chrome, although this is fine in Safari. Same image - it's the same event listing but viewed via different browsers.
Central image ('Crofton') is .jpg, 'saved for web' in photoshop - as are all images used. Story pics don't get this problem in Chrome, they scale down OK and don't end up with the right hand sidebar becoming superimposed.
Any ideas?
Neil