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 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 your email address formatted: yourname@yourdomain.com");
		formField.focus();
		result = false;
	}
   
  return result;

}

function allDigits(str)
{
	return inValidCharSet(str,"0123456789");
}

function validRequired(formField,fieldLabel)
{
	var result = true;
	
	if (formField.value == "")
	{
		alert('Please enter ' + fieldLabel +'.');
		formField.focus();
		result = false;
	}
	
	return result;
}

function inValidCharSet(str,charset)
{
	var result = true;

	// Note: doesn't use regular expressions to avoid early Mac browser bugs	
	for (var i=0;i<str.length;i++)
		if (charset.indexOf(str.substr(i,1))<0)
		{
			result = false;
			break;
		}
	
	return result;
}

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

	if (required && !validRequired(formField,fieldLabel))
		result = false;
  
 	if (result)
 	{
 		if (!allDigits(formField.value))
 		{
 			alert('Please enter your zipcode. Please make sure that your zipcode contains numbers only.');
			formField.focus();
			formField.select();
			result = false;
		} else {	
			 // Check that the zip is the right length
			if ( formField.value.length > 5 || formField.value.length < 3) {
				alert("Please enter a valid zipcode.");
				formField.focus();
				formField.select();
				result = false;
			 }
		}
	}
	return result;
}


function validateForm(theForm)
{
	if (!validZip(theForm.zipcode,"your zip code",true)) return false;	
	return true;
}

function validateMail(theForm)
{
	if (!validEmail(theForm.email,"your email address",true)) return false;		
	if (!validRequired(theForm.message,"your message",true)) return false;
	return true;
}