function jQueryHoldReady($, shouldHold) {
        if ($.holdReady) {
            $.holdReady(shouldHold);
        } else if (shouldHold) {
            $.readyWait += 1;
        } else {
            $.ready(true);
        }
    }
jQuery 1.4.3-1.5.x use a readyWait/ready() pairing to hold DOM
ready callbacks, but jQuery 1.6 supports a holdReady() API instead.
At some point remove the readyWait/ready() support and just stick
with using holdReady.