Use this one; it is good.<br>
<a href="http://www.hamline.edu/~arundquist/equationeditor/">http://www.hamline.edu/~arundquist/equationeditor/</a><br>
<br>
This one is ugly, but you'll live.<br>
<a href="http://www.atp.ruhr-uni-bochum.de/VCLab/software/HotEqn/HotEqn.html">http://www.atp.ruhr-uni-bochum.de/VCLab/software/HotEqn/HotEqn.html</a
>