You don't need any special "image map" code. Just put each of your links into /includes/templates/your_template/common/tpl_header.php, probably in the logoWrapper section or whatever makes sense to you for good organization, and style each of them like
Code:
#mapLink1 {
position: absolute;
top: 123px;
left:123px;
height: 123px;
width: 123px;
}
changing the 123 to suit for each property.
Give the #headerWrapper rule a property of
position: relative;
to give a positioning context to the links.
Give each link an id; you may need to have a pixel_trans.gif image in the link for older versions of IE to treat them properly - experiment.
Also give each link an alt="whatever" attribute for SEO and accessibility.