help with switches

I have a problem with a script.
a piece of it goes like this:

10 or 11 = "fall leaves"
12 or 1 = "snow"
4 or 5 = "rain"

Code:

---

 
var d = new Date();
var curr_month = d.getMonth();
if var curr_month == 1 then do function()

---

the function is snow.
i cant get to rain or leaves yet but i know they should work.
but the switch im using doesn't work and i cant pin down the problem.
can someone help me?

First thing you need to learn is that java is not javascript, in fact far from it, and while you are asking a javascript question, this is a java forum. For a more helpful answer, Google for a javascript forum and ask your question there. Best of luck.