Button problem

i have 3 buttons
every button linked to different movieclip … when i click on button 1 movieclip load correctly, but the problem is, when i click on button 1 again, movieclip load again …

the question is: i want when i click on button 1, i can’t click on it again, until i click on another button…

sorry but i had another question: i created my buttons animations with “lables” first lable is “over” for roll over and second is “out” for roll out, and lable “click”, lables “over” and “out” is working well, but the problem in “click” lable, when i click it stop where i put, but when i roll the mouse out the button, it goes to play “out” lable which is roll out, i think i need to use “if” condition… tell me what to do, and i will be thanks