passing nil as an argument

[Merick <Merick_TeVaran@...>]

When passing arguments to a function, I know that you can use 
myFunc(a,nil,c) to skip an argument (with the appropriate argument 
checking in the function of course). What I want to know is if there is 
a way to do it with myFunc(a,,c) and have the empty argument between the 
,, automatically be passed as nil.