There are arguments in favor of giving your tables a relative width because such table widths yield
pages that work regardless of the visitor's screen resolution. For example, a table width of 100% will
always span the entire width of the browser window whether the visitor has a 800x600 display or a
1024x768 display (etc). Your visitor never needs to scroll horizontally to read your page, something
that is regarded by most people as being very annoying.