How do I set up an Invitation Code field that modifies header depending on value(s)

[geoskep]

I would like to set up and Invitation Code field in user profiles that could have different and multiple values. Depending on the value(s), the user would see various header menu selections.

For example if the invitation code is 'ABC', I would like to see an ABC menu selection, if 'DEF', a DEF menu selection and if 'ABC DEF', both the ABC and the DEF menu selections.

I know how to set up the field; but I don't know how to make the '<if condition ' routine work in the header template when the Invitation Code field can have multiple values.


Any ideas.

Thanks