loadMovie

Hello to everyone, I hope someone can help me here,
I have 3 buttons in my scene, every one loads an external swf to an empty MC placed in the middle of the scene, so far so good, everything works, but if the user press a button more than once , it loads the external swf again, I want to stop the button after it loads the swf, I tried this:

on (press){
this.enabled=“false”;
}

but it does not work !

Here is the code of the button:

on (rollOver) {
gotoAndPlay(“over”);
}
on (press) {
gotoAndPlay(“down”);
}
on (releaseOutside, rollOut) {
gotoAndPlay(“go back”);
}
on (release) {
loadMovie(“info.swf”, “_root.mainHolder”);
}

Please help!!

Thanks,

Diego