CSS Superscript and line spacing

Hi everybody,

I've managed to get a SUBscript without messing the line spacing, using

vertical-align: baseline;

position: relative;

top: 0.4em

AND - I don't know why I had to do this too, but it worked - enclosing each subscript element with <span class="sub"></span> in the XHTML.

Now: I can't do the same with SUPERscript. I've tried -0,4em, tried bottom, tried bottom AND -0.4, tried top.... Do I have to monkey with the XHMTL again????

Superscript work when I simply use vertical-align: super, but I don't like the result.

Please help! Thank you!