function summary() {
document.getElementById('section1').style.display="block";
document.getElementById('section2').style.display="none";
document.getElementById('section3').style.display="none";
document.getElementById('project-links1').className="active";
document.getElementById('project-links2').className="";
document.getElementById('project-links3').className="";
}

function screenshots() {
document.getElementById('section3').style.display="block";
document.getElementById('section2').style.display="none";
document.getElementById('section1').style.display="none";
document.getElementById('project-links3').className="active";
document.getElementById('project-links1').className="";
document.getElementById('project-links2').className="";
}

function results() {
document.getElementById('section2').style.display="block";
document.getElementById('section3').style.display="none";
document.getElementById('section1').style.display="none";
document.getElementById('project-links2').className="active";
document.getElementById('project-links3').className="";
document.getElementById('project-links1').className="";
}