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function sendemail()
{
  var f = document.frmcontact;
  var msg = "";

  if (isEmpty(f.message)) {
    msg += "Please input message.\n";
  }
  if (isEmpty(f.yourname)) {
    msg += "Please input your name.\n";
  }
  if (isEmpty(f.youremail)) {
    msg += "Please input your email address.\n";
  }
  if (!isEmpty(f.youremail)) {
    if (!isEMail(f.youremail)) {
      msg += "Your email address is not valid, please input again.\n";
    }
  }

  if (msg != "") {
    alert(msg);
    return false;
  }
  ajax.setVar("yourname", f.yourname.value);
  ajax.setVar("youremail", f.youremail.value);
  ajax.setVar("message", f.message.value);
  ajax.requestFile = "sendmail.php";
  ajax.method = "POST";
  ajax.onCompletion = showMailSent;
  ajax.runAJAX();  
}

function clearform(needconfirm)
{
  if (needconfirm == undefined) {
    if (!confirm("Clear the information you have entered ?")) return;
  }

  var f = document.frmcontact;
  f.reset();
}


function showMailSent()
{
  clearform(false);
  alert("Thank you for your comments!");
}

function isEmpty(t)
{
  var s = new String(t.value);
  var re = /^\s*$/;
  return (s.match(re));
}

function isEMail(t)
{
  var s = new String(t.value);
  var re = /^\s*\S+[@]\S+[\.]\S+\s*$/;
  return (s.match(re));
}