Log-in Screen
 

I would like to create a splash screen when my workbook first opens and
all worksheet tabs are hidden by default. From there I would like to
create a log-in screen (with user name and password) and depending on
the user name, once entered it unhides only a selected worksheet or two
depending on who the user is.

i.e. If I log in as Admin ... then all worksheets will be displayed
i.e. If I log in as John ... only worksheet 2 is displayed etc etc
i.e. If I click cancel or don't enter a user name then Excel should exit

Hope someone can help me.