$('#blah').load('blah.htm',
    function(){
        var script = document.createElement('script');
        script.type = 'text/javascript';
        script.src = "[external script url + query string here]";
        $('#blah_blah')[0].appendChild(script);
});

$("#blah_blah")[0].appendChild(document.createTextNode("test"));

$.getScript("script.js");