I fixed Twitter Tools on Thursday, and now I’ve fixed the page menu on my blog. Turns out the theme I’m using was missing a couple CSS lines (I hate CSS almost as much as I hate JavaScript, but you have to use what you’ve got). I added these two lines to the Menu section

.Menu .current_page_item a {background: url(images/MLeft.png) no-repeat left
         bottom; color:#00a0e3; }
.Menu .current_page_item span { background: url(images/MRight.png) no-repeat
         right bottom; color:#00a0e3; }

And now the main page tabs display right.