function isValidZipCode(value) {
   var re = /^\d{5}([\-]\d{4})?$/;
   return (re.test(value));
}

function validate_submit(){
	var thisZip = document.locatorForm.zip;
	//alert(isValidZipCode(thisZip.value));

	if(isValidZipCode(thisZip.value) != false){
		return true;
		//document.locatorForm.submit();
	} else {	
		document.getElementById("err_zip").className = "";
		thisZip.className = "err";
		return false;
	}
}