/*-------------------------------------------------------------
 Phone Number Check.
 2001/02/14 Programmed by santiago
 Copyright (c) 2001 Iam Design Network. All Rights Reserved.
 $Id: checkPhoneNum.js,v 1.1.1.1 2003/04/07 09:03:34 santiago Exp $
 --------------------------------------------------------------*/
function checkPhoneNum(str) {
    for (var i = 0; i < str.length; i++) {
        var ch = str.substring(i, i + 1);
        if (!(ch >= "0" && ch <= "9")) {
            if (ch != "-") {
                return false;
            }
        }
    }
    return true;
}