// Form validation functions:
function trim_string(str)
{
  return str.replace(/^\s+|\s+$/g, "");
}

function email_validator(email_string)
{
	param = /^([a-zA-Z0-9_\.\-])+\@(([a-zA-Z0-9\-])+\.)+([a-zA-Z0-9]{2,4})+$/;

	if (param.test(email_string))
		return true;
	else
		return false;
}