BugMonkey script to warn user to update elapsed time when saving a case

elapsed.js

var sWarning = "The elapsed time has not been updated for " 
        + "this case!\n\n" 
        + "Do you want to save anyway?";

var fHasEstimate = ((goBug.hrsOrigEst + goBug.hrsCurrEst) > 0);
if (!fHasEstimate) return;

if (!window.clickBugSubmit) return;

window.clickBugSubmit = (function(fnOrig) {
    return function(e, elForm, fXMLSubmit, sValue, bOK) {
        if (bOK) {
            var hrsElapsed = stripNonNumeric($("#hrsElapsedExtraNew").val());
            var fElapsedChanged = (goBug.hrsElapsed != hrsElapsed);
            if (!fElapsedChanged && !confirm(sWarning)) {
                return cancel(e);
            }
        }
        return fnOrig.apply(this, arguments);
    };
})(window.clickBugSubmit);

// This function removes non-numeric characters
function stripNonNumeric(str) {
    str += '';
    var rgx = /^\d|\.|-$/;
    var out = '';
    for (var i = 0; i < str.length; i++) {
        if (rgx.test(str.charAt(i))) {
            if (!((str.charAt(i) == '.' && out.indexOf('.') != -1) || (str.charAt(i) == '-' && out.length != 0))) {
                out += str.charAt(i);
            }
        }
    }
    return out;
}