use setInterval....

example:
myFunction = function () {
myMC._x += 10;
if (myMC._x == 500) {
clearInterval(mySI);
}
}
mySI = setInterval(myfunctio,1000); //in miliseconds 1000 = 1s

This function will called in interval of 1 second

code?

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Sounds like you're using a for loop instead of an enterFrame handler or
setInterval...

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