function popupSet(x) {
   var popup = document.getElementById("pu");
   popup.style.display = "none";	
   const xhttp = new XMLHttpRequest();
   xhttp.open("GET", "setFunction.php?F=" + x, true);
   xhttp.send();
}

document.write('<div class="popup" id="pu">');
document.write('<div class="popupBox">');
document.write('<p><b>Which area is related to your interests?</b><br>');
document.write('Please click one of the following boxes:</p>');


document.write('<div class="popupID" onclick="popupSet(1)">Arts</div>');document.write('<div class="popupID" onclick="popupSet(2)">Humanities</div>');document.write('<div class="popupID" onclick="popupSet(3)">Culture</div>');document.write('<div class="popupID" onclick="popupSet(4)">Anthropology</div>');document.write('<div class="popupID" onclick="popupSet(5)">Sociology</div>');document.write('<div class="popupID" onclick="popupSet(6)">Environment</div>');document.write('<div class="popupID" onclick="popupSet(0)">Other</div>');
document.write('</div></div>');