function Trim(s) {
	return s.replace (/^\s*/,'').replace (/\s*$/,'');
}

function verify_message (text) {
	// check if there is a message
	var msg = Trim (text);
	if (!msg) {
		alert ("You did not enter a message!");
		return false;
	}
	return true;
}

function onError(form_object, input_object, object_value, error_message) {
	alert(error_message);
	return false;	
}

function checkinteger(object_value) {
	//Returns true if value is a number or is NULL
    //otherwise returns false	

    if (object_value.length == 0)
        return true;

    //Returns true if value is an integer defined as
    //   having an optional leading + or -.
    //   otherwise containing only the characters 0-9.
	var decimal_format = ".";
	var check_char;

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


function checknumber(object_value)
    {
    //Returns true if value is a number or is NULL
    //otherwise returns false	

    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, so...
    return true
}

function verify_form2 (form) {
	if (!verify_message (form.message.value)) return false;

	if (!Trim (form.realname.value) ) {
		alert ("You did not fill in your name!");
		return false;
	}

	if (!Trim (form.email.value) ) {
		alert ("You did not fill in your email adress!");
		return false;
	}

	var email = Trim (form.email.value);
	if (!email.match(/^[\w\.\-\_]+@[\w\.\-]+\.[\w\.\-]+$/)) {
		alert ("E-mail adress incorrect!");
		return false;
	}

	if (!Trim(form.vfynumber.value)) {
		alert ("You did not fill in the verification string!");
		return false;
	}

	var vfynumber = Trim (form.vfynumber.value);
	if (!vfynumber.match(/^[a-zA-Z0-9]{5}$/)) {
		alert ("Verification string incorrect format!");
		return false;
	}


	if (Trim (form.icq.value) )  {
		if (!checkinteger(form.icq.value)) {
			if (!onError(form, form.icq, form.icq.value, "Please fill in a valid ICQ number")) {
				return false; 
			}
		}
	}

	if (Trim (form.age.value)) {
		if (!checkinteger(form.age.value)) {
			if (!onError(form, form.age, form.age.value, "Please fill in a number for your age")) {
				return false; 
			}
		}
	}

	return true;
}

// To detect JavaScript version
var jsversion = 1.2;