function isEmailAddr(email)
{
  var result = false;
  var theStr = new String(email);
  var index = theStr.indexOf("@");
  if (index > 0)
  {
	var pindex = theStr.indexOf(".",index);
	if ((pindex > index+1) && (theStr.length > pindex+1))
  result = true;
  }
  return result;
}

function validRequired(formField,fieldLabel)
{
  var result = true;

  if (formField.value == "")
  {
	alert('Please enter a value for the "' + fieldLabel +'" field.');
	formField.focus();
	result = false;
  }

  return result;
}

function validEmail(formField,fieldLabel,required)
{
  var result = true;

  if (required && !validRequired(formField,fieldLabel))
	result = false;

  if (result && ((formField.value.length < 3) || !isEmailAddr(formField.value)) )
  {
	alert("Please enter a complete email address in the form: yourname@yourdomain.com");
	formField.focus();
	result = false;
  }

  return result;

}


function validNum(formField,fieldLabel,required)
{
  var result = true;

  if (required && !validRequired(formField,fieldLabel))
	result = false;

   if (result)
   {
	 var num = parseInt(formField.value,10);
	 if (isNaN(num))
	 {
	   alert('Please enter a number for the "' + fieldLabel +'" field.');
	  formField.focus();
	  result = false;
	}
  }

  return result;
}

function validDate(formField,fieldLabel,required)
{
  var result = true;

  if (required && !validRequired(formField,fieldLabel))
	result = false;

   if (result)
   {
	 var elems = formField.value.split("/");

	 result = (elems.length == 3); // should be three components

	 if (result)
	 {
	   var month = parseInt(elems[0],10);
		var day = parseInt(elems[1],10);
	   var year = parseInt(elems[2],10);
	  result = !isNaN(month) && (month > 0) && (month < 13) &&
			!isNaN(day) && (day > 0) && (day < 32) &&
			!isNaN(year) && (elems[2].length == 4);
	 }

	  if (!result)
	 {
	   alert('Please enter a date in the format MM/DD/YYYY for the "' + fieldLabel +'" field.');
	  formField.focus();
	}
  }

  return result;
}