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

	if (result && ((formField.value.length > 0) && !isEmailAddr(formField.value)) ) 
	{
		alert("Please enter a complete email address in the form: yourname@yourdomain.com");
		formField.focus();
		formField.select();
		result = false;
	}
   
  return result;

}

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();
		formField.select();
		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 validNum(formField,fieldLabel,required,length)
{
	var result = true;

	if (required && !validRequired(formField,fieldLabel))
		result = false;
		
	if ((required && length > 0) || (!required && formField.value.length > 0 && length > 0))
	{
		if (length != formField.value.length)
		{
			alert('Please enter a ' + length + ' digit number for the "' + fieldLabel +'" field.');
			formField.focus();
			formField.select();
			result = false;
		}
	}
  
 	if (result)
 	{
 		if (!allDigits(formField.value))
 		{
 			alert('Please enter a number for the "' + fieldLabel +'" field.');
			formField.focus();
			formField.select();
			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();
			formField.select();
			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 = allDigits(elems[0]) && (month > 0) && (month < 13) &&
					 allDigits(elems[1]) && (day > 0) && (day < 32) &&
					 allDigits(elems[2]) && ((elems[2].length == 2) || (elems[2].length == 4));
 		}
 		
  		if (!result)
 		{
 			alert('Please enter a date in the format MM/DD/YYYY for the "' + fieldLabel +'" field.');
			formField.focus();
			formField.select();
		}
	} 
	
	return result;
}

function validCreditCard(formField,fieldLabel)
{
	result = true;
	
	if (formField.value.length < 15 || formField.value.length > 16)
	{
		alert('Please enter a valid credit card number of 15 or 16 digits for the "' + fieldLabel + '" field.');
		result = false;
		formField.focus();
		formField.select();
	}
	
	return result;
}

function nextField(field, limit, next, evt)
{
	evt = (evt) ? evt : event;
	var charCode = (evt.charCode) ? evt.charCode : ((evt.keyCode) ? evt.keyCode : ((evt.which) ? evt.which : 0));
	if (charCode > 31 && field.value.length == limit) 
	{
		field.form.elements[next].focus();
		field.form.elements[next].select();
	}
}

function gotoNext(form, elemName, evt)
{
	evt = (evt) ? evt : event;
	var charCode = (evt.charCode) ? evt.charCode : ((evt.which) ? evt.which : evt.keyCode);
	if (charCode == 13 || charCode == 3)
	{
		form.elements[elemName].focus();
		form.elements[elemName].select();
		return false;
	}
	return true;
}

function firstField(form, field)
{
	form.elements[field].focus();
	form.elements[field].select();
}