function is_alt(field){
	if(field.value == field.alt)
		field.value = "";
}

function is_empty(field){
	if(field.value == "")
		field.value = field.alt;
}


function ssNext() {
    var $active = $('#slideshow IMG.active');
	if ( $active.length == 0 ) $active = $('#slideshow IMG:first');
	
    var $next =  $active.next().length ? $active.next()
        : $('#slideshow IMG:first');

    $active.addClass('last-active');

    $next.css({opacity: 0.0})
        .addClass('active')
        .animate({opacity: 1.0}, 1000, function() {
            $active.removeClass('active last-active');
        });
}

function ssPrevious() {
	var $active = $('#slideshow IMG.active');
	if ( $active.length == 0 ) $active = $('#slideshow IMG:first');
	
    var $previous =  $active.prev().length ? $active.prev()
        : $('#slideshow IMG:first');

    $active.addClass('last-active');

    $previous.css({opacity: 0.0})
        .addClass('active')
        .animate({opacity: 1.0}, 1000, function() {
            $active.removeClass('active last-active');
        });
}