var commonrules = {
	'body' : function(el) {

		// Get the footer and detach it
		var footer = document.getElementById("footer");
		var parent = footer.parentNode;
		parent.removeChild(footer);
		
		// create and append the footer div
		var footerDiv = document.createElement('div');
		footerDiv.className = 'footer';
		parent.appendChild(footerDiv);

		// append the footer to that div
		footerDiv.appendChild(footer);
    }
};

Behaviour.register(commonrules);