document.observe('dom:loaded', function() {
	if ($('book') !== null) {
		$('book').observe('click', function(event) {
			var clickedRow = event.findElement('tr');
			if (clickedRow) {
				if (clickedRow.down('input').checked) {
					clickedRow.down('span').className = 'unselected';
					clickedRow.down('input').checked = false;
				} else {
					clickedRow.down('span').className = 'selected';
					clickedRow.down('input').checked = true;
				}
			}
		});
	}
});

function mainmenu(){
	J$("#main_menu ul li").hover(function() {
		J$(this).css({cursor: "pointer"});
		J$(this).find('ul:first').css({visibility: "visible",display: "none"}).slideDown(400);
	}, function() {
		J$(this).find('ul:first').css({visibility: "hidden"});
	});
}

J$(document).ready(function(){					
	mainmenu();
});