How do I move the Menu button to the left with the Back button after an ajax request in jQuery mobile?

I've added one menu button in the top left corner that only appears when you open the site. And all the links on the page call external pages via ajax request (as specified by default in JQM). Now that I had the menu button on the right, I used the back button on the left after any ajax request, but since I moved the menu button to the right, the back button doesn't return anymore. Can someone please tell me how to override the menu button after ajax requests?