[Merjawy]

I am not sure what you mean by reverse direction.. If you mean to have 1/10 before the rest then you just need to switch things around. like this maybe

PHP Code:

[frc=12.343](10*a+b)[/frc]˙[frc=1]10[/frc] 


For the font you can insert font size right after the center tag. something like this

PHP Code:

<button style="background-color:transparent;border-width:0">
<center><font size=+1>
<sub><u>{option}</u></sub><br>
<sup><font style="text-decoration: overline;">{param}</font></sup>
</center>
</button>