function slideGallery() {
    var $active = $('#masthead img.active');
      
      
    var $next =  $active.next().length ? $active.next(): $('#masthead img:first');
    $active.addClass('last-active');
    
    $next.css({opacity: 0.0})
        .addClass('active')
        .animate({opacity: 1.0}, 2000, function() {
	    
            $active.removeClass('active last-active');
        });
}

$(function() {
    setInterval( "slideGallery()", 4000 );
    
});