an alternative to jQuery's JSONP method with basic error handling

jsonp.js

// fn to handle jsonp with timeouts and errors
// hat tip to Ricardo Tomasi for the timeout logic
$.getJSONP = function(s) {
    s.dataType = 'jsonp';
    $.ajax(s);

    var t = 0, cb = s.url.match(/callback=(\w+)/)[1], cbFn = window[cb];
    var $script = $('head script[src*='+cb+']');
    if (!$script.length)
        return; // same domain request

    $script[0].onerror = function(e) {
        $script.remove();
        $.handleError(s, {}, "error", e);
        clearTimeout(t);
    };

    if (!s.timeout)
        return;

    window[cb] = function(json) {
        clearTimeout(t);
        cbFn(json);
        cbFn = null;
    };

    t = setTimeout(function() {
        $script.remove();
        $.handleError(s, {}, "timeout");
        if (cbFn)
            window[cb] = function(){};
    }, s.timeout);
};