var current_page;

function main(page_name) {
	current_page = page_name;
	button_set(page_name);
}

function button_normal(name) {
	if (name == current_page) { return; }
	var e = document.getElementById('button-' + name);
	e.style.cssText = "background-image: url('images/buttons/normal/" + name + ".png');";
}
		
function button_highlight(name) {
	if (name == current_page) { return; }
	var e = document.getElementById('button-' + name);
	e.style.cssText = "background-image: url('images/buttons/highlight/" + name + ".png');";
}

function button_set(name) {
	var e = document.getElementById('button-' + name);
	e.style.cssText = "background-image: url('images/buttons/selected/" + name + ".png');";
}

function slideSwitch() {
    var $active = $('#slideshow IMG.active');

    if ( $active.length == 0 ) $active = $('#slideshow IMG:last');

    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');
        });
}