Question in viewings

[Σπύρος Σβορώνος]

Hi everyone,
I am quite new and i have a relatively simple question for which i do not seem 
to find the answer. When i try to view a field that has a name which is a 
number (e.g. A field named "123"), if i write something like:

function(doc)
{
If (doc.123)
{ list of args}
}

I get an error saying that the expression does not eval to a function. Does 
anybody know how can i view a field that has this structure?

Thanks in advance,
Spiros