DD-WRT redirect all requests to specific page in WWW

Hi! I have TP-LINK WR1043ND build r19519 big one. I need help to set up redirection of all WLAN requests to Web page stored in internet. Moreover user can't go anywhere except this page. On this page user may post comments, pass tests, may be upload some photo and so on. Also, router must translate users MAC adress to web server. Preferrable solution is make some script with redirection all traffic to specific web page URL. Thank you!