replace the template "postbit_online" with this:
<table style="filter:glow(color=red)">Online</table>
and replace the template "postbit_offline" with this:
Offline
Now I'm just not sure on how to define the glow size, the color is no problem but the size, hmm...
EDIT: okay, here it is:
<table style="filter:glow(color=#C4C400, strength=2)">Online</table>
There, voil?.