Contains in Functionality based URLs

Contains in Functionality based URLs

Anybody knows how to do this :

I have 2 Forms:
-Users (with a Checkbox field name Country, multiple select)
-Customer (with a field for Country)

I'd like to show in a view only the customers that a user belong to.

Here are my parameters for the Customer view:
Country=<%=User.Country%>&Country_op=26

I think the op=26 is applicable only on the left side... Is there a way to apply it to <%=User.Country%> ?

Any other tips would be appreciated.

Thanks

Pascal Veilleux