Limit of number of dropdowns selected

[ll]

This script contains the check for a single drop down; however, I am
needing to check to make sure that only one of my seven drop down boxes
is selected - is there a way to assign a count variable (increment)
whenever a drop down is selected and thus use that in the checking
mechanism, or would there be a simpler way?

Thanks

 

[ll]

This script contains the check for a single drop down; however, I am
needing to check to make sure that only one of my seven drop down boxes
is selected - is there a way to assign a count variable (increment)
whenever a drop down is selected and thus use that in the checking
mechanism, or would there be a simpler way?

Thanks