problem with Session variable

I need some help. I have created an asp page. At Login, User will have to enter both username and password. If its a succesful login, i will assign the type of access the user has on a Session variable which will be my basis on which menu options to display on my menu.asp. When the user for example deletes a record(one option from menu.asp),i will need to redirect the page back to menu.asp so as to offer other options. The problem is that when i redirect the page(using response.redirect("menu.asp")), the Session variable will loose the value and so the menu.asp will not display the same options anymore. This only happens if i set on the Default Website of IIS my default home page but it's working fine if i dont set anything on IIS. I was wondering what was the problem if its on my asp code that i need to change or from the IIS settings?Any ideas?