function showContactForm() { document.getElementById("contactForm").style.display = "block"; } function hideContactForm() { document.getElementById("contactForm").style.display = "none"; } function validateForm() { var name = document.forms["contactForm"]["name"].value; var email = document.forms["contactForm"]["email"].value; var message = document.forms["contactForm"]["message"].value; var error = ""; if (name == "") { error += "You must enter your name.\n"; } if (email == "") { error += "You must enter your email address.\n"; } if (message == "") { error += "You must enter a message.\n"; } if (error != "") { alert(error); return false; } } <form id="contactForm" action="/action_page.php" style="display