Webpages lose their place when I return to them

Whenever I click on a link in either Firefox or IE7, when I return to the back button it bounces to the top of the previous page.

This is annoying as it wastes time scrolling down a page again to where I thought I was.

Is there something I can do to fix this?

running Vista Home Edition and this only happened in the past couple of days.

Thanks for any help.

Jo & Jim