Convert String to Array

Is there a nifty function that will convert a String to an Array in AS(1 or 2)?

Something like:

myString = “1, 2, 4, 3”;
myArray = myString;

…and then myArray ends up like:

myArray = [1, 2, 4, 3];

Im trying to add the content of a loaded textfile into an array, thats why. Maby there is some other workaround?