These pages should display properly in either 800 x 600 or 1024 x 768 resolution, although the latter resolution will allow more of a large image to display without scrolling.
If you are using a recent version of Microsoft Internet Explorer as your browser, an image that is too large to fit within your browser window will be automatically reduced in size so that it fits. This may degrade the image as well as make it smaller. If a full-size image fills your browser window from top to bottom, it has probably been reduced in size. Pass your mouse pointer over the lower-right corner of the image and see if this symbol appears under the pointer:
If it does, click on it to expand the image to full size. But then, you probably already knew that.