BHO - small functions

Hello, I'm looking for someone who has experience writing Internet Explorer Extensions. If you have never written one then do not bother replying, save your credits for some other project. I am looking for the following functions: 1) Function to execute javascript code in the page - must always work (unlike the function I currently have...) 2) function to insert <script src="[login to view URL]"></script> 3) Function to make an AJAX call from withing the extension. Must support CORS. I need a quote and timeframe for: 1) and 2) 3) 1); 2) and 3) ideally, you should have this code already as I need it soon.