Linking header image to home page

I want link header image back to the home page (index.php), so when user click on header image this bring back to the homepage.
Problem is that header image is called from a CSS file, and there’s no hyperlink: [URL=”http://ppukltd.com/”]example[/URL]

I find some tips, [URL=”http://docs.joomla.org/Creating_clickable_background_images_using_CSS”]Creating_clickable_background_images_using_CSS[/URL], but dont know how to implement this for this template and what is correct way to do it.

Here is header CSS:

#header {
float: left;
width: 802px;
height: 127px;
background: url(../images/header.jpg) no-repeat;
}

Here is part of index.php that call header:

<div id=”header”>
&nbsp;
</div>

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