//function to validate an email address
function validateEmail(aElement)
{
	var aFormElement = aElement.formElement;
	var Params = aElement.Params;
	var value = aFormElement.value;
   	var format = /^([a-zA-Z0-9_\.\-])+\@(([a-zA-Z0-9\-])+\.)+([a-zA-Z0-9])+$/;
	return format.test( value );
}
validator.registerValidationFunction('email',validateEmail);