//Function to format floats
//returns false if invalid
//dec = number of decimal places to show
function fmtFloat(obj, dec) {
    var lt = "", rt = "", str = ""
    var inc = 0, num = 0, tmp = 0

    if (obj.value.length == 0)
        obj.value = "0";

    if (!checkChars(obj.value, ".,0123456789")) return false;

    // Check for valid number
    stripChars(obj, ",");
    if (!checkNumber(obj.value)) return false;

    //Split number
    inc = Math.pow(10, dec);
    num = (obj.value * 1.0);
    num = Math.round(num * inc) / inc;
    str = "" + num;

    tmp = str.indexOf(".");
    if (tmp < 0) {
        str += ".";
        tmp = str.indexOf(".");
    }

    if ((str.length - tmp) <= dec)
        for (var i = (str.length - tmp); i <= dec; i++)
        str += "0";

    obj.value = str;
    return true;
}

//Function to format integers
//returns false if invalid
function fmtInt(obj) {
    if (obj.value.length == 0) {
        obj.value = "0";
        return true;
    }

    return (checkInteger(obj.value));
}

//Function to formats money fields
//returns false if invalid
function fmtMoney(obj) {
    var dec = 0, num = "", sign = 0
    var dollars = "", cents = ""
    var count = 0, tmp = ""

    if (obj.value.length == 0) {
        tmp = "0";
        cents = ".00";
    } else {
        if (!checkChars(obj.value, "$.,0123456789")) return false;

        // Check for valid number		
        stripChars(obj, ",");
        sign = obj.value.indexOf("$");
        if (sign > 0)
            return false;
        else {
            if (sign == 0)
                num = obj.value.substring(1, obj.value.length);
            else
                num = obj.value;

            if (!checkNumber(num))
                return false;
        }

        // Check precision, round-up if necessary
        if (num.indexOf(".") != -1)
            num = "" + (Math.round(num * 100) / 100.0);

        dec = num.indexOf(".");
        cents = ((dec > 0) ? num.substring(dec, num.length) : ".00");
        if (cents.length == 2) cents += "0";

        // Add commas
        dollars = "" + parseInt(num);
        for (var i = dollars.length - 1; i >= 0; i--) {
            if (count == 3) {
                tmp = "," + tmp;
                count = 1;
            } else
                count++;

            tmp = dollars.charAt(i) + tmp;
        }
    }

    // Format number
    num = "$" + tmp + cents;
    obj.value = num;
    return true;
}

//Function to format phone numbers
//returns false if invalid
function fmtPhone(obj) {
    var phone = "";
    var oldphone = "";

    if (obj.value.length == 0) return true;

    //Remove formatting
    oldphone = obj.value;
    stripChars(obj, "- ()");
    phone = obj.value;
    if (!checkChars(phone, "0123456789")) return false;

    if (phone.length == 10)
        obj.value = "(" + phone.substring(0, 3) + ") " + phone.substring(3, 6) + "-" + phone.substring(6, 10);
    else {
        obj.value = oldphone;
        return false;
    }

    return true;
}

//Function to format social security numbers
//returns false if invalid
function fmtSSN(obj) {
    var ssn = ""

    if (obj.value.length == 0) return true;

    //Remove all dashes
    stripChars(obj, "-");
    ssn = obj.value;
    if (!checkChars(ssn, "0123456789")) return false;

    if (ssn.length == 9)
        obj.value = ssn.substring(0, 3) + "-" + ssn.substring(3, 5) + "-" + ssn.substring(5, 9);
    else
        return false;

    return true;
}

//Function to verify valid URL
function fmtURL(obj) {
    if (obj.value.length == 0) return true;

    if (obj.value.substring(0, 7) != "http://")
        obj.value = "http://" + obj.value;

    if (obj.value.length < 10) return false;

    return true;
}

//Function to format zip codes
//returns false if invalid
function fmtZip(obj) {
    var numberlist = "0123456789", zip = ""

    if (obj.value.length == 0) return true;

    // Remove dashes
    stripChars(obj, "-");
    zip = obj.value;
    if (!checkChars(zip, numberlist)) return false;

    if (zip.length == 5)
        obj.value = zip;
    else if (zip.length == 9)
        obj.value = zip.substring(0, 5) + "-" + zip.substring(5, 9)
    else
        return false;

    //Passed all tests
    return true;
}

//Returns true if every character is in string list
//otherwise false
function checkChars(val, charlist) {
    for (var i = 0; i < val.length; i++)
        if (charlist.indexOf(val.charAt(i)) < 0)
        return false;

    //String passed so it is valid							
    return true;
}

//Returns true if valid email
//otherwise returns false
function checkEmail(obj) {
    var email = obj.value, name = "", host = "", tld = ""
    var atSign = 0, dot = 0

    if (obj.value.length != 0) {
        atSign = email.lastIndexOf("@");
        // Check for more than one @
        if (email.indexOf("@") != atSign) return false;

        dot = email.lastIndexOf(".");
        if (atSign > dot) return false;

        // Break up email into 3 sections: name@host.tld			
        name = email.substring(0, atSign);
        host = email.substring(atSign + 1, dot);
        tld = email.substring(dot + 1, email.length);

        // Check for illegal chars
        if (findChars(name, ":/")) return false;
        if (findChars((host + tld), "[]<>")) return false;

        // Check for min length
        if (name.length < 1) return false;
        if (host.length < 2) return false;
        if (tld.length < 2) return false;
    }

    // Valid, passed all tests
    return true;
}

//Returns true if value is a number or is NULL
//otherwise returns false	
function checkInteger(object_value) {
    if (object_value.length == 0)
        return true;

    if (object_value.indexOf(".") < 1)
        return checkNumber(object_value);
    else
        return false;
}

//Returns true if value is a number or is NULL
//otherwise returns false	
function checkNumber(object_value) {
    if (object_value.length == 0)
        return true;

    //Returns true if value is a number defined as
    //   having an optional leading + or -.
    //   having at most 1 decimal point.
    //   otherwise containing only the characters 0-9.
    var start_format = " .+-0123456789";
    var number_format = " .0123456789";
    var check_char;
    var decimal = false;
    var trailing_blank = false;
    var digits = false;

    //The first character can be + - .  blank or a digit.
    check_char = start_format.indexOf(object_value.charAt(0))
    //Was it a decimal?
    if (check_char == 1)
        decimal = true;
    else if (check_char < 1)
        return false;

    //Remaining characters can be only . or a digit, but only one decimal.
    for (var i = 1; i < object_value.length; i++) {
        check_char = number_format.indexOf(object_value.charAt(i))
        if (check_char < 0)
            return false;
        else if (check_char == 1) {
            if (decimal)		// Second decimal.
                return false;
            else
                decimal = true;
        } else if (check_char == 0) {
            if (decimal || digits)
                trailing_blank = true;
            // ignore leading blanks
        } else if (trailing_blank)
            return false;
        else
            digits = true;
    }

    //All tests passed
    return true
}

//Returns true if value is a posiitve integer or is NULL
//otherwise returns false	
function checkPosInteger(object_value) {
    if (object_value.indexOf("-") != -1)
        return false;
    else
        return (checkInteger(object_value));
}

//Function to find any char in charlist in the passed string
//Returns true if a character is found
//Otherwise false
function findChars(str, charlist) {
    for (var i = 0; i < charlist.length; i++) {
        if (str.indexOf(charlist.charAt(i)) != -1)
            return true;
    }

    return false;
}

//Function to remove all occurances of chars in charlist
function stripChars(obj, charlist) {
    var i = 0, pos = 0
    var val = obj.value

    while (i < val.length) {
        pos = charlist.indexOf(val.charAt(i));
        if (pos != -1)
            val = val.substring(0, i) + val.substring(i + 1, val.length);
        else
            i++;
    }

    obj.value = val;
    return true;
}