/* FORMAT PHONE BEHAVIOR MASK */
function formatPhoneNum(e, input) {
    /* to prevent backspace, enter and other keys from  
    interfering w mask code apply by attribute  
    onkeydown=FormatPhone(control) 
    */
    evt = e || window.event; /* firefox uses reserved object e for event */
    var pressedkey = evt.which || evt.keyCode;
    var BlockedKeyCodes = new Array(8, 27, 13, 9); //8 is backspace key 
    var len = BlockedKeyCodes.length;
    var block = false;
    var str = '';
    for (i = 0; i < len; i++) {
        str = BlockedKeyCodes[i].toString();
        if (str.indexOf(pressedkey) >= 0) block = true;
    }
    if (block) return true;

    s = input.value;
    if (s.charAt(0) == '+') return false;
    filteredValues = '"`!@#$%^&*()_+|~-=\QWERT YUIOP{}ASDFGHJKL:ZXCVBNM<>?qwertyuiop[]asdfghjkl;zxcvbnm,./\\\'';
    var i;
    var returnString = '';
    /* Search through string and append to unfiltered values  
    to returnString. */
    for (i = 0; i < s.length; i++) {
        var c = s.charAt(i);
        if ((filteredValues.indexOf(c) == -1) & (returnString.length < 13)) {
            if (returnString.length == 0) returnString += '(';
            if (returnString.length == 4) returnString += ')';
            if (returnString.length == 5) returnString += ' ';
            if (returnString.length == 9) returnString += '-';
            returnString += c;
        }
    }
    input.value = returnString;

    return false
}
/* END FORMAT PHONE */