It shows for me, on the front site and the forum, or do you mean in the white area on the forum (above the blue vBulletin bar).
If thats what you mean, the code is:
<header id="header" role="banner">
<p id="title"><a href="http://www.ibusinessbuzz.co.uk/" title="iBusinessBuzz">iBusinessBuzz</a></p><h1 id="tagline">UK Business News, Articles and Discussion</h1></div>
That a tag would want an image inside it rather than iBusinessBuzz or some CSS that sets the image as a background image.
The width and height obviously set to whatever height and width you need.
If you want a rollover effect, create an image map (normal and hover state), with the normal image and the hover state below it. Then use background-position to move it on rollover in CSS.