function validateForm() {
  var name = document.getElementById('name').value;
  var email = document.getElementById('email').value;
  var subject = document.getElementById('subject').value;
  var message = document.getElementById('message').value;
  var companyname = document.getElementById('companyname').value;
  var companyaddress = document.getElementById('companyaddress').value;
  var phone = document.getElementById('phone').value;
  var position = document.getElementById('position').value;
  var howlearnedmessage = document.getElementById('howlearnedmessage').value;
  
  if (name == "" || email == "" || subject == "" || message == ""
      || companyname == "" || howlearnedmessage == "" || position == ""
      || companyaddress == "") {
    alert("Please fill out all fields.");
    return false;
  } else if (document.getElementById('concerning').value == "default") {
    alert("Please indicate what this message is concerning.");
    return false;
  } else if (validateEmail(email, true, false) == false) {
    alert("The email address you have entered is not valid.");
    return false;
  }
}

// Email Validation Javascript
// copyright 23rd March 2003, by Stephen Chapman, Felgall Pty Ltd

// You have permission to copy and use this javascript provided that
// the content of the script is not changed in any way.

function validateEmail(addr,man,db) {
  if (addr == '' && man) {
    if (db) alert('email address is mandatory');
    return false;
  }
  var invalidChars = '\/\'\\ ";:?!()[]\{\}^|';
  for (i=0; i<invalidChars.length; i++) {
    if (addr.indexOf(invalidChars.charAt(i),0) > -1) {
      if (db) alert('email address contains invalid characters');
      return false;
    }
  }
  for (i=0; i<addr.length; i++) {
    if (addr.charCodeAt(i)>127) {
      if (db) alert("email address contains non ascii characters.");
      return false;
    }
  }

  var atPos = addr.indexOf('@',0);
  if (atPos == -1) {
    if (db) alert('email address must contain an @');
    return false;
  }
  if (atPos == 0) {
    if (db) alert('email address must not start with @');
    return false;
  }
  if (addr.indexOf('@', atPos + 1) > - 1) {
    if (db) alert('email address must contain only one @');
    return false;
  }
  if (addr.indexOf('.', atPos) == -1) {
    if (db) alert('email address must contain a period in the domain name');
    return false;
  }
  if (addr.indexOf('@.',0) != -1) {
    if (db) alert('period must not immediately follow @ in email address');
    return false;
  }
  if (addr.indexOf('.@',0) != -1){
    if (db) alert('period must not immediately precede @ in email address');
    return false;
  }
  if (addr.indexOf('..',0) != -1) {
    if (db) alert('two periods must not be adjacent in email address');
    return false;
  }
  var suffix = addr.substring(addr.lastIndexOf('.')+1);
  if (suffix.length != 2 && suffix != 'com' && suffix != 'net' && suffix != 'org' && suffix != 'edu' && suffix != 'int' && suffix != 'mil' && suffix != 'gov' & suffix != 'arpa' && suffix != 'biz' && suffix != 'aero' && suffix != 'name' && suffix != 'coop' && suffix != 'info' && suffix != 'pro' && suffix != 'museum') {
    if (db) alert('invalid primary domain in email address');
    return false;
  }
  return true;
}