Help with Asus script

Hello!! it´s the first time that write here, and i´m sorry for my english

I want change my actual neutral router Linksys wrt54gl for the asus rt n66u

I have configured all like the old one but i have one thing that i don´t know how do it

I have one script that execute every 15 minutes to check if any dispositive is conected to the wireless router and if there isn´t anything switch off the wifi

I want do the same in Asus but i don´t know how modify this script, in asus router have to wifi...

Help with Asus script