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 "' + fieldLabel +'".');
		formField.focus();
		result = false;
	}
	
	return result;
}

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

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 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,fieldLengh,required)
{
	var result = true;

	if (required && !validRequired(formField,fieldLabel))
		result = false;
  
 	if (result)
 	{
 		if ((!allDigits(formField.value)) || (formField.value.length < fieldLengh))
 		{
 			alert('Please enter ' + fieldLengh +' digits for the "' + fieldLabel +'" field.');
			formField.focus();		
			result = false;
		}
	} 
	
	return result;
}

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

	if (required && !validRequired(formField,fieldLabel))
		result = false;
  
 	if (result)
 	{
 		if (formField.value.length < fieldLengh)
 		{
 			alert('Please enter ' + fieldLengh +' digits for the "' + fieldLabel +'" field.');
			formField.focus();		
			result = false;
		}
	} 
	
	return result;
}

function validNumRange(formField,fieldLabel,fieldLengh1,fieldLengh2,required)
{
	var result = true;

	if (required && !validRequired(formField,fieldLabel))
		result = false;
  
 	if (result)
 	{
 		if ((formField.value.length < fieldLengh1) || (formField.value.length < fieldLengh2) || (formField.value > 1000))
 		{
 			alert('Donation: Min. $1 - Max. $1000');
			formField.focus();		
			result = false;
		}
	} 
	
	return result;
}


function validInt(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 validMatch(formField,formField2,fieldLabel)
{
	var result = true;

	if (formField.value != formField2.value)
 	{
 		alert('The passwords do not match');
		formField.focus();		
		result = false;
	}
	
	return result;
}

function validDate(formField,formField2)
{
	var result = true;
	
	var d=new Date();
	var month=new Array(12);
		month[0]="01";
		month[1]="02";
		month[2]="03";
		month[3]="04";
		month[4]="05";
		month[5]="06";
		month[6]="07";
		month[7]="08";
		month[8]="09";
		month[9]="10";
		month[10]="11";
		month[11]="12";

	var checkMonth = month[d.getMonth()];
	var checkYear = d.getYear();
	
	var chekCard = checkMonth+ '-' +checkYear;
	
	var tocheck = formField.value+ '-' +formField2.value;
	
	if (tocheck <= chekCard)
	{
 		alert('Credit card expiration date is not valid');
		formField.focus();
		result = false;
	}
	
	return result;
}

function validateFile(theForm) {
  	var file = theForm.upfile.value;
  	if (!file) {
    	alert('Please enter a PDF filename');
    	return false;
  	}
  	file = file.toLowerCase();
  	if (file.lastIndexOf('.pdf') == file.length-4) return true
  	alert('Please enter a PDF filename');
  	return false;
}

function validateCheckout(theForm)
{
	if (!validRequired(theForm.firstname,"First Name"))
		return false;

	if (!validRequired(theForm.lastname,"Last Name"))
		return false;

	if (!validEmail(theForm.email,"Email Address",true))
		return false;
	
	return true;
}