connection of arduino with my website

first thanks for your reply a lot , i am thinking about doing my webpage on arduino in two pages:
1st page:user send (username + password) to arduino using get form i will save the password and username in arrays and let it compare them with the data user enter if true go to second page that i control things from it

the only problem in that way the website will be for only 1 user ,, also is what i am saying is good or right ?