YAHOO.namespace('example.dom');

YAHOO.example.dom.init = function() {

	var random_number= Math.round(Math.random()*6);
	
	switch (random_number)
	{
	case 1:
		YAHOO.util.Dom.addClass('header', 'theme1');
	break
	case 2:
		YAHOO.util.Dom.addClass('header', 'theme2');
	break
	case 3:
		YAHOO.util.Dom.addClass('header', 'theme3');
	break
	case 4:
		YAHOO.util.Dom.addClass('header', 'theme4');
	break
	case 5:
		YAHOO.util.Dom.addClass('header', 'theme5');
	break
	case 6:
		YAHOO.util.Dom.addClass('header', 'theme6');
	break
	default:
		YAHOO.util.Dom.addClass('header', 'theme1');
	}
};

YAHOO.util.Event.onDOMReady(YAHOO.example.dom.init);