i agree with the previous post, but you could just redeign the site so it wouldn't cause problems with future users. if you make it accesible with 800x600 screen size, then you know it's gonna fit all bigger sizes.
try <width="100%">.. actually this works on images smaller on width..when you set a certain width to 100% (sample: 800width.jpg image set to <img src=800width.jpg width="100%"> it stretches on a 1024x768 screen. So images could be streched with the <width="100%"> attributes...Problem now is it couldnt be shrinked...sample a fixed 1024width image couldnt be shrinked into 800 by just adding the <width=100%> attribute. on tables, contexts no problems. the problem occurs mostly on fixed size images.
although there are image tricks out there like blending your image to the background and setting a certain sliced portion to shrink and stretch. (streched images dont look good)