User administration. Max 20

Index will show twitters from an account, i already have the script. Index will have login and also signup if needed and on the ledft side one link that says Contest On contest site just logged users can acces, they will see a link on that contest section When click on that link will be redirected to the [login to view URL] this script has to check wich number of visitor is, if its number 301, 401 or 501 the user gets a message as winner. the [login to view URL] also has to check that the user comes from a certain url: [login to view URL] max 20