function startLoading() {
	Element.show('loading');
	Element.hide('content');
}
function finishLoading() {
	Element.show('content');
	setTimeout("Effect.toggle('loading');", 0);
}
function loadContent(id,article) {
	startLoading();
	new Ajax.Updater('content', 'modules/city_select.php', {method: 'post', postBody:'city_id='+ id +'&article_id='+ article +''});
	finishLoading();
}