function onSubmit_orderForm(lng)
{
	var err_msg = "";
	var valid_email = /^([\w-]+(?:\.[\w-]+)*)@((?:[\w-]+\.)*\w[\w-]{0,66})\.([a-z]{2,6}(?:\.[a-z]{2})?)$/i
	
	if (document.orderForm.jmeno.value.length == 0)
	{
		switch(lng)
		{
			case 'cz': err_msg += "- není vyplněno Vaše jméno\r\n"; break;
			case 'de': err_msg += "- please input Your name\r\n"; break;
			case 'fr': err_msg += "- please input Your name\r\n"; break;
			default:
			case 'en': err_msg += "- please input Your name\r\n"; break;
		}
		
	}
	if (document.orderForm.telefon.value.length == 0) 
	{
		switch(lng)
		{
			case 'cz': err_msg += "- není vyplněno Vaše telefonní číslo\r\n"; break;
			case 'de': err_msg += "- please input Your phone number\r\n"; break;
			case 'fr': err_msg += "- please input Your phone number\r\n"; break;
			default:
			case 'en': err_msg += "- please input Your phone number\r\n"; break;
		}
	}
	if (document.orderForm.email.value.length == 0 || !valid_email.test(document.orderForm.email.value)) 
	{
		switch(lng)
		{
			case 'cz': err_msg += "- není/není správně vyplněna Vaše e-mailová adresa\r\n"; break;
			case 'de': err_msg += "- please input Your valid e-mail address\r\n"; break;
			case 'fr': err_msg += "- please input Your valid e-mail address\r\n"; break;
			default:
			case 'en': err_msg += "- please input Your valid e-mail address\r\n"; break;
		}
	}
	
	if (err_msg.length > 0)
	{
		switch(lng)
		{
			case 'cz': err_msg = "Neúplně vplněný formulář:\r\n" + err_msg; break;
			case 'de': err_msg = "Please correct form:\r\n" + err_msg; break;
			case 'fr': err_msg = "Please correct form:\r\n" + err_msg; break;
			default:
			case 'en': err_msg = "Please correct form:\r\n" + err_msg; break;
		}
		alert(err_msg);
		return false;
	} else {
		return true;
	}
}	//	onSubmit_orderForm