<!-- Original:  Brian Swalwell -->

<!-- This script and many more are available free online at -->
<!-- The JavaScript Source!! http://javascript.internet.com -->

<!-- Begin
function validateZIP(field) {
	var valid = "0123456789-";
	var hyphencount = 0;
	
	if ((field.length!=5 && field.length!=10) || parseInt(field,10) ==0) {
			alert("Please enter your 5 digit or 5 digit+4 zip code.");
			return false;
	}
	
	for (var i=0; i < field.length; i++) {
		temp = "" + field.substring(i, i+1);
		if (temp == "-") hyphencount++;
		if (valid.indexOf(temp) == "-1") {
			alert("Invalid characters in your zip code.  Please try again.");
			return false;
		}
		if ((hyphencount > 1) || ((field.length==10) && ""+field.charAt(5)!="-")) {
			alert("The hyphen character should be used with a properly formatted 5 digit+four zip code, like '12345-6789'.   Please try again.");
			return false;
		}
	}
	return true;
}
//  End -->