Sending Value If Conditions Fulfilled

I have a javascript which verifies if the submitted data is a number or not, and works like a charm, but... I also want to be able to tell if the number is "0" and then submit other data.

Here is my script:
Code:
// Makes sure variable is a number
function validNum(nmbr){
// forces variable into integer type
nmbr = (nmbr * 1);

// Checks if variable is Not a Number
if(!isNaN(nmbr))
// If a number, return value
return nmbr;
else
// If not a number, return zero
return 11;
}
Now, what I want is to add "0" as not a number and change that to "11" as the last else...