why i can't update my param in ie<7 with js file load?
<p>i load a js file use script tag in html ,the response content is 'window.paramname = {...}',
paramname's content will changed every request by url param,so i want the paramname to be changed too.</p>

<pre><code>    var callback = params.callback || function() {};
if (_script.readyState) { //IE
    _script.onreadystatechange = function() {
        if (_script.readyState == "loaded" || _script.readyState == "complete") {
            _script.onreadystatechange = null;
            callback();
            _script.parentNode.removeChild(_script);
        }
    };
} else { //Others
    _script.onload = function() {
        callback();
        _script.parentNode.removeChild(_script);
    };
}
_script.src = params.src;


    my callback function

//callback
Q.loadJs({
    src:u,
    id:"script_id",
    callback:function(){
        alert(paramname.length);
    }
});
</code></pre>
