static function assign($tpl_var, $value = null)
{
if (is_array($tpl_var)) {
foreach ($tpl_var as $key => $val) {
if ($key != '') {
self::$_tpl_vars[$key] = $val;
}
}
} else {
if ($tpl_var != '') {
self::$_tpl_vars[$tpl_var] = $value;
}
}
}