$(function() 
{
    $('#mainContent div:not(:first)').hide();
});

function switchMenu(num)
{
	/* tots els menus a 'notSelected' */
	$('#nav li').removeClass('selected');
	$('#nav li').addClass('notSelected');
	
	/* activar el menu corresponent */
	$('#menucontent_'+ num).removeClass('notSelected');
	$('#menucontent_'+ num).addClass('selected');
	
	/* mostrar DIV */
	$('#mainContent div').hide();
	$('#mainContent div#content_'+ num).fadeIn();
}