function content_strip($content){
$content = preg_replace('/<img[^>]*src=[\'"]?([^>\'"\s]*)[\'"]?[^>]*>/ie',"wap_img('$1')",$content);
return $content;
}
function wap_img($url){
$img='<img src="'http://www.dtmuban.com/course/.$url.'">';
return $img;
}