AJAX Page Navigation Div Reload, No page reload (Dynamic (PHP Content))

I need a website muchlike [login to view URL] It uses AJAX I believe when I talked to the Website owner/administrator. I do not need the layout, I just need a simple file that reloads a div, not the whole page. I would love for it to use pushState. Ill post examples of what I am hoping on doing, I need to make sure the code is simple to add/edit after you give it to me. I need it to also have dynamic paging because I code in PHP. I NEED TO MAKE SURE IT ONLY RELOADS THE ONE DIV, NOT THE PAGE. I have a radio player just like the website above, and I would like it to run no matter what page it is. I want to be able to give exact links to pages, instead of people having to find their way through everything. If you have a $_GET statment and some Lorem Ipsum, I should be fine. Changing page title when a new Div is loaded would be a plus, but not mission critical on my list [login to view URL] (goes to) ( /content/radio/[login to view URL]) [login to view URL]$username (Goes to) (/content/profile/[login to view URL]$username [login to view URL]$username/info (brings the info div in the profile page, still allowing access to their main wall) If you do very good, I will come back to you for more work.