Users with CSS disabled will see whatever is in
<h1>Company Inc.</h1>
users with CSS will see the Company Inc. logo
to use this, add this to your stylesheet:
h1 { text-indent: -100em; overflow: hidden; background: url(logo.png) no-repeat; height: 100px; width: 100px; }
The Gilder-Levin method is a good alternative (http://www.mezzoblue.com/tests/revised-image-replacement/)
Note, yes, its rare that people are browsing around with images off and css on, but if you do care, gilder-levin is a nice solution.