Quote Originally Posted by Quix

#showtooltip Counterspell
/stopcasting
/target focus
/assist focus
/castsequence reset=24 Counterspell,,,
I'm pretty sure you can drop '/target focus' from the macro. The /assist focus line is all you need. I prefer to use /assist Party1 because my mage usually has a focus target that he is suppose to sheep.

I think the following will do the trick for you:

[code:1]#showtooltip Counterspell
/stopcasting
/assist party1 (use raid1 if in a raid)
/castsequence reset=24 Counterspell,,,
[/code:1]