One each page I have the same four buttons, e.g, A1, A2, A3, A4

So in theory you could navigate from the home screen to A1, from A1 to A2 right through to A4.

I want to know how the end-user can revert back to the original page they were on instead of having to scroll-back through each page.

For example.

If the user was on page 2 and tapped A1, then from here A2, and then A3.  Using the back button would automatically go back to page 2.

Presently doing this the user would have to go back A3>A2>A1.

These pages could be called from any of the five main pages on the mobile site so this scenario could occur when using Page1, Page2, Page3 and so on so it is not a straight forward link back to a certain page.

Any help would be great.

Thanks.