[senocular]

or you can use setTimeout - clearing itself after one call.
First though, since its not a native Flash function it needs to be defined, so put this in the first frame of your movie to define it:

_global.setTimeout = function(a,b,c, args){
    // for a basic function call:
    if (typeof arguments[0] == "function"){
        args = arguments.slice(2);
        var ID, func = function(){
            a.apply(null, args);
            clearInterval(ID);
        }
        ID = setInterval(func, b, args);
        
    // for an object method call:
    }else{
        args = arguments.slice(3);
        var ID, func = function(){
            a[b].apply(a, args);
            clearInterval(ID);
        }
        ID = setInterval(func, c, args);
    }
    return ID;
}
_global.clearTimeout = clearInterval;

Then replace your setIntervals there with setTimeout and they'll only run once.