Using Wireframes

There are various methods by which to walk one through the user experience. There are use-case scenarios and navigation maps. A third way is called wireframes.

Wireframes are black and white sketches or drawings that illustrate what the user will see on the respective site. The name wireframe derives from from the fact that the drawings are only an outline sketch as to what he web pages will look like. Think of wireframes as bein analogous to storyboards. Wireframes is a quick way to help in deisgn layout, evaluate and describe the various ways your web site could look like.

Here's some additional information regarding the use of wireframes.
Another example to read.