Can I combine <span> tags at runtime?

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Hi,
I have some methods which generate html formatting for text on the fly. I
generally use <spantags and that works fine. But, I would like to be able
to combine different formatting elements on the fly. For example if I have
<span text-decoration: "underline">
and want to add to that
<span BACKGROUND-COLOR:"red">,
I would get
<span text-decoration:"underline"; Background-Color:"red"(or whatever the
correct syntax is).

Before I embark on writing my own struct to do this, does anyone know if
something like this exists already or if there is a better way?
Thanks!
Ethan

Ethan Strauss Ph.D.
Bioinformatics Scientist
Promega Corporation
2800 Woods Hollow Rd.
Madison, WI 53711
608-274-4330
800-356-9526
et***********@promega.com