Defining a command with two parameters in a layout

[A Rosina Bignall]

I'm trying to create a layout for a latex style that I use regularly.  One of 
the commands has two parameters.  For example, in LaTeX, I would write:

\addresses{my home address}{my work address}

How can I define this command to Lyx? My stab at it is

Style Addresses
  LatexType             Command
  LatexName             addresses
  LabelType             Static
  LabelString           Addresses:
End

But, I don't see any way to tell LyX that this command has two parameters.  I also 
have a command with three parameters to make things yet more interesting.  What do you 
suggest?

Thanks
Rosina Bignall