Avoiding writing same function twice

Question

Hello,
I want to avoid writing XMLSocket.prototype.onData = function(msg) twice.
The msg static data are sent only at the first time.  It includes data for populating combo.  Depening on the combo selection, different set of data from msg are displayed.
mySocket = new XMLSocket();
mySocket.connect("127.0.0.1", 9999);
System.security.loadPolicyFile("http://localhost/sockets/flash_policy.php");
mySocket.onConnect = function(success) {
    if (success) {
        msgArea.htmlText += "<b>Server connection established!</b>";
        mySocket.send("connected"+"\n");
    } else {
        msgArea.htmlText += "<b>Not Connected</b>";
mySocket.onClose = function() {
    msgArea.htmlText += "<b>Server connection lost</b>";
//for displaying static data
XMLSocket.prototype.onData = function(msg) {
    //trace(msg);
    arr = msg.split("&");
    textHeadline.htmlText += arr[0];
        comboBox(arr);   
function displayData(combo_id)
XMLSocket.prototype.onData = function(msg) {
    arr = msg.split("&");
    textA.htmlText += arr[1];   
    textB.htmlText += arr[2];
function comboBox(arr)
  //combo code
  //selected combo id is sent to displayData
   displayData(combo_id);
Thanks

Answer 1

I have been thinking along the lines of what Wayne said.
Can I initialise the Assistant by calling it outside the loop, but with a True constant on the 'stop' input, and then run the rest of the function as normal? Would I not get the error about 'resource is reserved ' or in use or whatever it is?
Stephen : I have tried troubleshooting by stepping through the execution, but I find it doesn't run accurately. Since the function stops recording when a succession of near-identical points are detected (when the piston stops), if I run it in 'highlight execution' mode it will get 5000 points each for retract and extend (assistant is set to 1k buffer size, 5 successive similar points stops the execution). 
I will fool around with setting up the function before the loop, until someone gives more suggestions.