function select_menu_element(selector) {
	
	var selected_element = jQuery(selector);
	var content          = selected_element.children();
	var dimensions = {
		width:  content.outerWidth() - 2,
		height: content.outerHeight() - 2,
		top:    content.position().top
	};

	if (jQuery('div#selected').length == 0) {
		jQuery('ul#menu').append(
			jQuery('<div>&nbsp;</div>')
				.attr({id: 'selected'})
				.css(dimensions)
		);
	} else {
		jQuery('div#selected').css(dimensions);
	}

	selected_element.addClass('selected');
}