<!--
function _CF_onError(form_object, input_object, object_value, error_message)
    {
	alert(error_message);
       	return false;	
    }

function _CF_hasValue(obj, obj_type)
    {
    if (obj_type == "TEXT" || obj_type == "PASSWORD")
	{
    	if (obj.value.length == 0) 
      		return false;
    	else 
      		return true;
    	}
    else if (obj_type == "SELECT")
	{
        for (i=0; i < obj.length; i++)
	    	{
		if (obj.options[i].selected)
			return true;
		}
       	return false;	
	}
    else if (obj_type == "SINGLE_VALUE_RADIO" || obj_type == "SINGLE_VALUE_CHECKBOX")
	{
		if (obj.checked)
			return true;
		else
       		return false;	
	}
    else if (obj_type == "RADIO" || obj_type == "CHECKBOX")
	{
        for (i=0; i < obj.length; i++)
	    	{
		if (obj[i].checked)
			return true;
		}
       	return false;	
	}
	}

function _CF_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 _CF_checknumber(object_value);
    else
	return false;
    }

function _CF_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  _CF_checkofferta(_CF_this)
    {
    if  (!_CF_hasValue(_CF_this.ww_qta, "TEXT" )) 
        {
        if  (!_CF_onError(_CF_this, _CF_this.ww_qta, _CF_this.ww_qta.value, "input the quantity"))
            {
            return false; 
            }
        }
    if  (!_CF_checkinteger(_CF_this.ww_qta.value))
        {
        if  (!_CF_onError(_CF_this, _CF_this.ww_qta, _CF_this.ww_qta.value, "input a valid number for the quantity"))
            {
            return false; 
            }
        }
    return true;

    }

function  _CF_checkrivista(_CF_this)
    {
    if  (!_CF_hasValue(_CF_this.ww_qta, "TEXT" )) 
        {
        if  (!_CF_onError(_CF_this, _CF_this.ww_qta, _CF_this.ww_qta.value, "input the quantity"))
            {
            return false; 
            }
        }
    if  (!_CF_checkinteger(_CF_this.ww_qta.value))
        {
        if  (!_CF_onError(_CF_this, _CF_this.ww_qta, _CF_this.ww_qta.value, "input a valid number for the quantity"))
            {
            return false; 
            }
        }
    return true;
    }
		
function  _CF_checkvolumi(_CF_this)
    {
    if  (!_CF_hasValue(_CF_this.ww_qta, "TEXT" )) 
        {
        if  (!_CF_onError(_CF_this, _CF_this.ww_qta, _CF_this.ww_qta.value, "input the quantity"))
            {
            return false; 
            }
        }
    if  (!_CF_checkinteger(_CF_this.ww_qta.value))
        {
        if  (!_CF_onError(_CF_this, _CF_this.ww_qta, _CF_this.ww_qta.value, "input a valid number for the quantity"))
            {
            return false; 
            }
        }
    return true;
    }		
		
		function  _CF_checkacc(_CF_this)
    {
    if  (!_CF_hasValue(_CF_this.ww_qta, "TEXT" )) 
        {
        if  (!_CF_onError(_CF_this, _CF_this.ww_qta, _CF_this.ww_qta.value, "input the quantity"))
            {
            return false; 
            }
        }
    if  (!_CF_checkinteger(_CF_this.ww_qta.value))
        {
        if  (!_CF_onError(_CF_this, _CF_this.ww_qta, _CF_this.ww_qta.value, "input a valid number for the quantity"))
            {
            return false; 
            }
        }
    return true;
    }		
//-->