function validateEmail(addr,man,db) {
if (addr == '' && man) {
   if (db) alert('You must include your email address for your message to be sent');
   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 ) {
   if (db) alert('The email address you typed does not appear to be valid. \nPlease ensure you have typed it correctly or use another email address. ');
   return false;
}
return true;
}

function validateContactForm (form) {
  for (var e = 0; e < form.elements.length; e++) {
    var el = form.elements[e];
    if (el.name == 'contactName' || el.name == 'contactEmail' || el.name == 'contactTelephone' || el.name == "contactSubject" || el.name == "contactMessage") { 
      if (el.value == '' || el.value == ' ') {
        alert('Please make sure you have provided:\n\n - your name\n - your e-mail address\n - and a message\n\nbefore sending.');
        el.focus();
        return false;
      }  
    }
  }
  return true;
}