function selectPortfolioPage(page) {
    var imagesets = $$('div.imageset');
    for(var i = 0; i < imagesets.length; i++) {
        imagesets[i].className = 'imageset-hidden';
    }
    $('imageset-' + page).className = 'imageset';
    
    var moreimages = $$('div.more-images-page-active');
    for(i = 0; i < moreimages.length; i++) {
        moreimages[i].className = 'more-images-page';
    }
    $('more-images-button-' + page).className = 'more-images-page-active';
}