Loading jQuery on parent page via an iFrame

Loading jQuery on parent page via an iFrame

Hi, I believe I have pretty unique request ...

I'd like to know if it's at all possible to load jQuery and run scripts on a parent page via a hidden iFrame.

I know this may sound strange, without getting into a great big explanation, we don't have access to code on the parent page so we cannot load jQuery or any JS for that matter.

We can have a hidden iFrame and call a custom page - where I'm hoping we use to load jQuery and other custom code on the parent page via the iFrame,

We need to show an overlay window / popup window on the parent page, which we normally cant since we don't have access to the code - but possibly via a hidden iFrame we could achieve this? 

I don't have the necessary skills to write some thing like this - and even if you offer me solutions, I wont be able to make use of them - I really just need to know if this is at all possible and if there's anyone willing to help me out - happy to hire someone and pay if need be.

This is urgent and hope I get promising feedback.

Thanks.