function is_empty(form_name)
{
	email_value = document.forms[form_name].email.value;
	if(!email_value)
	{
		alert('Enter email');	
		return false;
	}
	else
	{
		if(!is_email(form_name))
		{
			return false;
		}
	}
	phone = document.forms[form_name].telephone.value;
	if(!phone)
	{
		alert('Enter phone');
		return false;
	}
	country = document.forms[form_name].country.value;
	if(!country)
	{
		alert('Enter country');
		return false;
	}
	message = document.forms[form_name].message.value;
	if(!message)
	{
		alert('Enter message');
		return false;
	}
	return true;
}

function is_email(form_name)
{
	email_value = document.forms[form_name].email.value;
	if (email_value.indexOf("@")==-1)
	{
		alert('e-mail address is invalid, please re-enter your e-mail address');
		return false;
	}
	return true;
}