small change needed to work in all browsers
including FF4

I changed this:
this.createScript = function( _parent, _id, _request )

{
var span = this.createElement( _parent, 'span', {'style.display' : 'none', 'id' : _id}, '%' );
setTimeout(
function(){
var _script = span.getElementsByTagName('script')[0];
_script.type = 'text/javascript';
_script.src = _request;
}, 5);
}


To:
this.createScript = function( _parent, _id, _request )
{
setTimeout(
function(){
var s = document.createElement('script');
s.type = 'text/javascript';
s.src = _request;
document.body.appendChild(s);
}, 5);
}