This page loaded in a new window. The link on the left included the attribute target="top". Whenever you set the target to "top" a new fully functional copy of the browser window opens. Notice that the back button is not functional. This is because the page loads as the initial page in the new window.
Click here to go to page two. Then you can return with the "back" button.
Because this is a fresh copy of the browser, the only way to return to your previous page is to close this window. Click on the X in the upper right corner of this window.