// functions
function changeBg(id, url) {
	var obj = $(id);
	if ( obj ) {
		try {
			obj.setStyle('background-image', 'url("'+url+'")');
		} catch (e) {
			obj.setStyle('display', 'none');
		}
	}
}

// standard events
window.addEvent('domready', function() {

	

});