help: need sommelier advice!

[newsguy]

hi,

we're going to bern's in tampa for new year's eve dinner. it's supposed to be a great steakhouse with one of the better wine lists in the country.

my questions are these: exactly how do you tip a sommelier? i've only recently gotten into wines and have yet to go to a fine restaurant and order a few bottles. can u add the sommelier's tip to the wait staff's tip at the end when the bill comes. how do you denote that this part of the tip is from the sommelier?

and, if the sommelier is helpful, but i choose the wine based on my own knowledge, how much of a tip should that require?

as always, thanks! i'll let you all know what we drink.

keith