How can I find oxidation number of N in N2O?

[Titan97]

Homework Statement

How can I find oxidation number of N in N2O using lewis dot structure?

Homework Equations

None

The Attempt at a Solution

Is the structure of N2O like this:

 

[gracy]

http://chem-net.blogspot.in/2011/10/lewis-dot-structures-simple-procedure.html
See if it helps.