WotLK Macro for Viper/Serpent sting

[Myrthen]

Hi,
is there any way to make a macro for Viper sting for mana using mobs and Serpent sting for mobs that don't use mana?
I tried
#show tooltip
/cast Viper sting
/cast Serpent sting(Rank 10)

but it doesn't seem to work. Any suggestions?

[Blind]

No, there's no way to make that on an automated basis.

Only thing you could do is use a modifier to bind both to the same key.

Would look something like this:
#showtooltip Viper Sting (or Serpent Sting, your choice)
/cast [nomod] Viper Sting
/cast [mod:alt] Serpent Sting