function checkForm() {
	var allFields = Array("txtFirstName", "txtLastName", "txtAddress", "txtCity",
							   "txtState", "txtZIP", "txtEmail", "txtTelephone",
							   "txtRoomNights", "txtCorporateYear", "code");
							   
	for (var i=0; i<allFields.length; i++) {
		var item = document.frmMain[allFields[i]];
		if (item.value.length < 1) {
			alert("Please fill in all required fields.");
			item.focus();
			return false;
		}
	}

	return true;
}