My doubt is regarding history api feature of html5 which is using ajax script.

In my code after loading index.html, i have tried to open html content using link in central section of page. Upto this is done but when i click to back button then url is changing but content was of previous page.

following is my js code :
Code:
function supports_history_api() 
{
return !!(window.history && history.pushState);
...