Need help with Tic Tac Toe script

I am working on creating an assessment on uses of an iPod. The learner has the freedom to select any three questions as long as they form a Tic Tac Toe when they are completed. What I have created so far:
1.All 9 square on the main stage, the suqares were converted to a movie clip
2. The learner clicks on a square and then taken to a page of their own ie. square one opens a square one more detailed question and place to type in answer
3. The learner types in their answer into an input text box - the enter button takes the learner to a correct page or a need to review page
4. I have attached a button on the correct page that will change the color of the square on the main page when the learner returns to the main page
The problem:

the changed square color does not stay changed when the learner answers another question and goes back to the main page. Square one returns back to the original color.
What do I do to get the square to change color to show the learner has this question correct.?
I have attached the script below attached to the correct page the learner uses to return to the main page:

This is on the page the learn is directed to when they select the correct answer. This will take the learner back to the main page with all 9 squares.The square 1 will change color. but when the learner moves onto another square, square 1 changes back to the origiinal color. How do I get it to stay changed?

on (release) {
gotoAndStop(1);
}
on (release) 
{ 
colorchange = new Color("/square1"); 
colorchange.setRGB(0xff33cc); 
}

Thanks for your help.
Sharon Covert