sup { position: relative; height: 0; bottom: 1ex; line-height: 1em;
      vertical-align: baseline; _vertical-align: bottom; /* ie6 hack */ }

If you want to adjust the vertical position of the superscript, try adjusting the bottom style. A value of 1ex will leave it in it's default position, but I personally prefer .5ex to bring it down just a touch.

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