// Functions from 
// http://www.w3schools.com/jS/js_form_validation.asp

function validate_required(message,alerttxt)
{
with (message)
  {
  if (value==null||value=="")
    {
    alert(alerttxt);return false;
    }
  else
    {
    return true;
    }
  }
}

function validate_email(field,alerttxt)
{
with (field)
  {
  apos=value.indexOf("@");
  dotpos=value.lastIndexOf(".");
  if (apos<1||dotpos-apos<2)
    {alert(alerttxt);return false;}
  else {return true;}
  }
}

function validate_form(thisform)
{
with (thisform)
  {
  if (validate_required(message,"Message box must be filled in!")==false)
  {message.focus();return false;}
  if (validate_required(email,"Email must be filled out!")==false)
  {email.focus();return false;}
  if (validate_email(email,"Not a valid e-mail address!")==false)
    {email.focus();return false;}
  }
}

function validate_mailingList(thisform)
{
with (thisform)
  {
  if (validate_required(subscribe_email,"Email must be filled out!")==false)
  {subscribe_email.focus();return false;}
  if (validate_email(subscribe_email,"Not a valid e-mail address!")==false)
    {subscribe_email.focus();return false;}
  }
}