I really need to know if this is possible before I install the UserGroups Mod. Has anyone done something like this? I want each User Group to have their own header and nav bar.
No, not familiar with the UserGroup mod but I assume a member's usergroup ID is determined in inc_header.asp. What you're going to have to do is strip all the HTML out of inc_header.asp and create a new include for each group's headers then use a select case statement to include the necessary header. Bear in mind though that the server opens every single include no matter what so, if you've a lot of groups, it will slow down page generation time. A better solution may be to use conditionals to to write the necessary HTML from inc_header.asp rather than using includes.
Search is your friend “I was having a mildly paranoid day, mostly due to the fact that the mad priest lady from over the river had taken to nailing weasels to my front door again.”