.pop() Method on Global Array

How can I pop() or shift() a globally declared array in a function? I get no error, but it also does nothing. I need to access this array from multiple functions, so I've declared it globally. From within other functions I can look up values in the array, and I can traverse the entire array as a collection with a for(...) loop. .length isn't returning a correct value either.

Thanks,
Andrew

Here's a sample:

Here's the javascript:

inlets=1;
outlets=1;
autowatch=1;

var bars = new Array();
var RFID = new String;

function bang() {
    post("***n");
    for(var bar in bars) {
        post("RF: " + bar + ", Length: " + bars[bar] + "n");
    }
    post("***n");
}

function NewRF(rf,l) {
    RFID=rf;
    bars[rf]=l;
    bang();
}

function GetBar(rf) {
    l=bars[rf];
    post("Length: " + l + "n");
}

function Remove() {
    n=bars.pop();
    post("Removing: " + n + "n");
    bang();
}