Wrap node description $node->body in <div>

Hello,

on all my template customisations I add a div around each node's body field.
I created a bodywrapper.module that does just this, but it would make more sense to have this on the template.

Here what the module does:

/**
 * Wraps each node's BODY field in <div class="field field-node-body"> 
 * for better styling options. 
 */

function phptemplate_nodeapi(&$node, $op, $teaser, $page) {
	$node->content[body]['#value'] = "<div class=\"field field-node-body\">$node->content[body]['#value']</div>";
}

The code above doesn't work, it's from the module, but I think you understand where I'm going.

Thanks.