Creating a counter

Question

i already posted this before but that seems to only work on counters and button clicks in the same scene
i am using actionscript 1 and 2
i have created 18 scenes
scene 3 to 7 are questions
each time an answer is correctly answered, the counter should increase by 1
i want scene 18 to have the number of answers answered correctly
example:
when you click on the correct answer on 3, i want the counter in scene 18 to increase by 1
the actionscript already on the correct answer is:
on (release) {
     gotoAndPlay ("Scene 3", 4);
so far i have created a counter on scene 18 with the actionscript on the timeline with a dynamic text box with nothing else done to it:
_root.counter = 0;
a button to go back to the start of the quiz and to reset the counter back to 0 is on scne 18 with the actionscript:
on (release) {
     _root.counter = 0;
     gotoAndStop ("Scene 2", 1);
state anything i have done wrong and suggest a way to correct it
thank you for your help

Answer 1

the counter is supose to be on scene 18
when i  click on the correct answer, i want the counter to increase by one
each question is on a different scene though