function checkform() {
  if ((document.getElementById('name').value!='')&&(document.getElementById('topic').value!='')&&(document.getElementById('filename').value!='')) {
    document.getElementById('subbutton').disabled = false;
  } else {
    document.getElementById('subbutton').disabled = true;
  }
}
function checkreg() {
  if ((document.getElementById('login2').value!='')&&(document.getElementById('email2').value!='')&&(document.getElementById('pass2').value!='')&&(document.getElementById('pass3').value!='')) {
    document.getElementById('subm').disabled = false;
  } else {
    document.getElementById('subm').disabled = true;
  }
}