ActionScript 2; replace string any number of times

The cheeseparing number of useful String class methods released by Adobe leaves something for the programmer to do. Here is a replace function that will replace a substring within another string any number of times. It starts at the first occurrence.

  // replace findThis string from stringIn with replaceWith, repeat number of times
  //repeat must be >=1, anything else it will do 1 repeat anyway
 // if the string doesn't occur nothing will happen

  public static function replaceString(stringIn:String, findThis:String, replaceWith:String, repeat:Number):String {

    var stringOut:String = '';
    var tempArr:Array;
    tempArr = stringIn.split(findThis); //spilt the string into an array based on the occurrences of the target string
    stringOut = tempArr[0]; //get the first split item
    for (var i=1;i < tempArr.length;i++){
        if (i < repeat+1){
            stringOut = stringOut + replaceWith + tempArr[i];// replace the next occurrence and add the next split item
        }
        else {
            stringOut = stringOut + findThis + tempArr[i];// restore the rest of the string as it was
        }
    }
    trace("String in: " + stringIn + " String out: " + stringOut);
    return stringOut;
  }