bigguy

Hello, I'm makign a download type thing for my school, and I need to know how I can get the admins password, at my school, and thna the user tryign to download something, has to type in the admin;s password, to download anything. And than once they type the password, it will let them downlaod whatever they want, but than i want t make it where once that download is complete. When tey try to download sumthign else they have to type the password again. And for thos of you wondering, no I'm not trying to make a hack or anything, but our school network, keeps getting viruses becasue the 8th graders keep dowloading stuff. Any help is appreciated. Thnka You