hi
i was thinking about my project, but i can't do it.
i describe my project and i hope that any one can help me :

in my assembly project , we have many character(5 or 6 ,....in different location in screen (on executable screen)) and when user click on any character(for first) , it(selected charecter) must be disapear and when user reclick on there again,the character will be appear.

http://up.vatandownload.com/images/dixibgrs0gw8kzqff14p.png

how can i write it. you can see my wanted view above.
sorry for my lang.