function add_to_cart(str){
   AjaxRequest.get(
    {
     'url':'templates/add_to_cart.php?typ=' + str
     ,'onSuccess':function(req){
	//document.getElementById('div_cart').innerHTML = req.responseText;
	//alert('added to cart:' + req.responseText);
	//alert('added to cart');
	//document.getElementById('_default').submit();
	window.location = "http://czech-transport.com/index.php?menu_id=cart"
      }
     ,'onError': function(){
	alert('error occured');
      }
    }
   );
}