As a general rule, images should be no wider than 472 pixels in order to display correctly on most monitors. It may be necessary to reduce this width further when using frames to reduce the need for the user to scroll horizontally. Frames Never use frames just to show that you know how to use frames. Frames can reduce the usable area to a tiny fraction of the screen. There are potential copyright issues when another site shows up within the frame of your site.
Printing is often difficult.
Sizing The width of the browser's window can effect how your page is displayed. The width of most computer screens varies from about 640 to 1280 pixels. Your Web page should work properly with the browser window set anywhere within this range. Text can wrap and therefore, be adjusted in width. Tables, cells, and images don't wrap and can not be adjusted in width.