function gotoPage(page){
document.getElementById('create').className = 'hidden';
document.getElementById('promotion').className = 'hidden';
document.getElementById('support').className = 'hidden';
document.getElementById('portfolio').className = 'hidden';
document.getElementById('about').className = 'hidden';

document.getElementById('link-create').className = 'link';
document.getElementById('link-promotion').className = 'link';
document.getElementById('link-support').className = 'link';
document.getElementById('link-portfolio').className = 'link';
document.getElementById('link-about').className = 'link';

document.getElementById(page).className = '';
document.getElementById('link-' + page).className = 'link-selected';
}