Alright so this is what i use for my Shaman and figured it could be just as easily used for a mage. im not the greatest with macros but i figured this out after repeatidly typing stuff in random sequences trying to figure out the correct order.
/focus
/cast [modifier:shift;target=focus] Hex
Casting Hex on %f Feel Free to smack em up.
the modifier part is so you can press shift then click the same button instead of having multiple macro buttons. you can change shift to ctrl but thats the only other modifier i can think of. Now that i think of it you can pretty much use this for any silence or intterupt spell you can think of.
Well Hopefully this helped someone who is not too familiar with macros out. Happy Holidays