Clickable background

Hi. How do i make the background image clickable? I am going to replace the original bg_body.gif with an advertisers image instead. I change the background properties to repeat image both on x- and y-axis, but where do i find the div-tag where i can insert the link tag? Im thinking it should appear something like this : <div class="background"><a href="http://www.advertiser.domain"></a></div> ?

I think that's not a good idea to stretch a link to the whole page... not sure how will this affect on other links on the same page. Try to find a java script which does what you are looking for instead.