/**  * wrap javascript codes with a html-tag  * @author Wilson Zeng */ function js($script){
   return ''."\n"; } /**  * wrap javascript codes with a html-tag & history back  * @author Wilson Zeng  * @param $message [optional] show alert() if is given  * @param $url [optional] the next step that will jump to if is given  * @author Wilson Zeng */ function jsBack($message = NULL, $url = NULL, $addslashes = TRUE){
   $script = ''; if($message){
   $script .= 'alert("'.str_replace('"', '\"', ($addslashes ? addslashes($message) : $message)).'");';     } $script .= $url ? 'location.href="'.$url.'";' : 'history.back();'; echo js($script); exit(0); }