gistfile1.txt

myDataSource.connMgr = {
    asyncRequest: function (req, callback) {
        var originalFailureHandler = callback.failure;
        callback.failure = function (o) {
            if (o.status == '403') {
                // Do your thing
            } else {
                originalFailureHandler(o);
            }
        };

        YAHOO.util.Connect.asyncRequest(req,callback);
    },
    isCallInProgress : YAHOO.util.Connect.isCallInProgress,
    abort: YAHOO.util.Connect.abort
};