I've got a form that I want to test to make sure the user entered a zip code in a valid array and I'm not sure how to check it...

The zip code list is like 11111, 11114, 11117, so I can't just include a range...

I had written a function like:

Code:
function validate_zip(field,alerttxt)
{
	with (field)
	{
		if (value==null||(value<"11111"||value>"11174"))
		  {alert(alerttxt);return false;}
		else {return true}
	}
}
but, I have to exclude the non-inclusive zip codes...so, how do I create an array and test against it???

TIA!!!