75348 ASP Mail Script correction

I have a script in ASP that has a bug in it. When you log into an account, and are in for more than 15 minutes, it gives this error. : Microsoft VBScript runtime error '800a0009' Subscript out of range: '[number: 2]' /email/[login to view URL], line 239 it is supposed to default back to the login page, but instead I get this error. I need someone to make this script go back to the login page instead of giving me the error. I can give you the address of the page its supposed to go back to