function FormatPhone(phone_number, formatted_field_name) {

	var new_phone_number;
	var formatted_field;

	new_phone_number = phone_number;

	new_phone_number = new_phone_number.replace(/\D+/g, "");
	
	if (new_phone_number[0] != "1")
      {
	   new_phone_number = "1" + new_phone_number;
      }

	if (new_phone_number.length > 11)
	{
	   new_phone_number = new_phone_number.substring(0, 11);
	}

	formatted_field = this.document.getElementsByName(formatted_field_name);
	formatted_field[0].value = new_phone_number;

	return new_phone_number;
}

function DisplayFormatPhone(elm, e) {
    var keychar;

    // If used in onkeypress, pass in the event and this will
    // grab the character and do the right thing. This allows
    // for a smoother user experience than if the chars are
    // being visibly deleted.
    if (e) {
        var keynum;
        if (window.event) {
            keynum = e.keyCode
        }
        else if (e.which) {
            keynum = e.which
        }

        keychar = String.fromCharCode(keynum)
    }   

    // Allow a backspace to go through, so the user
    // can correct any typos.
    if (/[\b]/.exec(keychar)) {
        return true;
    } else {
        var p = elm.value + keychar;

        // Don't allow a leading 1 or 0. We also strip out all
        // non-numeric characters here to make the formatting
        // easier later on. This could be modified to allow
        // letters if you consider them valid.
        p = p.replace(/^[01]/,"");
        p = p.replace(/\D+/g, "");

        // You can easily change the formatting of the phone
        // number by editing the conditionals below.
        if (p.length > 0 && p.length < 3) {
            p = "("+p;
        }
        else if (p.length >= 3 && p.length < 7) {
            p = "("+p.substring(0,3)+") "+p.substring(3);
        }
        else if (p.length >= 7 && p.length < 10) {
            p = "("+p.substring(0,3)+") "+p.substring(3,6)+"-"+p.substring(6);
        }
        else if (p.length) {
            p = "("+p.substring(0,3)+") "+p.substring(3,6)+"-"+p.substring(6,10);
        }
        elm.value = p;

        return false;
    }
}