Custom javascript for dynamic headlines based on URL paramaters

I have a landing page found here [login to view URL] I would like for someone to create some custom javascript so that the headline is created dynamically, based on the URL string (the "comment" parameter, specifically). Here's an example. Someone arrives at the page with this URL: [login to view URL] generation&ag=Marketing%20Automation%20-%20Sales&camp=Marketing%20Automation&_kk={creative} The headline would say: Looking for Lead Generation? We can help you! Just the "lead generation" part of the headline changes, and it always capitalizes the first letter of each word. The code should include a default option, so that if either of these conditions is true, then it uses the default word: 1) There is no keyword in the URL string. 2) The keyword exceeds 25 characters with spaces. The deliverable is a piece of code that I can paste into my landing page. If you want to also host a javascript file somewhere else, that's fine. Please just deliver the file and I'll host it.