function gb_post(lang)
{
	var name = encodeURIComponent(document.getElementById('name').value);
	var city = encodeURIComponent(document.getElementById('city').value);
	var email = encodeURIComponent(document.getElementById('email').value);
	var message = encodeURIComponent(document.getElementById('message').value);
	
	var post_string = 'lang=' + lang +'&name=' + name + '&city=' + city + '&email=' + email + '&message=' + message;

	jx.load('/ajax/post_gb?' + post_string, function(data) {
		
	var form = document.getElementById('gb_form');
	form.style.visibility='hidden';
	
	var message_div = document.getElementById('message_div');
	message_div.innerHTML = data;
	},'text','post');
}