function checkform ( form )
{
  var error;
  if (form.mailfrom.value == "" || form.mailfrom.value.indexOf('@') < 0 || form.mailfrom.value.indexOf('.') < 0 ) {
    error = "Please enter a valid email address.";
    form.mailfrom.focus();
  } else if( form.subject.value == "") {
  	error =  "Please enter a subject.";
  	form.subject.focus();
  } else if( form.message.value == "") {
  	error = "Please enter a message.";
  	form.message.focus();
  }
  if( error != null ) {
  	document.getElementsByName('errorText')[0].innerHTML = error;
  	return false;
  }
  document.getElementsByName('errorText')[0].innerHTML = "";
  return true;
}