function autocomplete_reinitialize()
	{
		autocompleteObject.url = "get_tubes.php?city_id="+$("city_id").value;
	}
	
	function autocomplete_initialize()
	{
		var autoObject = new Ajax.Autocompleter("autocomplete", "autocomplete_choices", "get_tubes.php?city_id="+$("city_id").value,
		 {paramName: "landmark_name", 
		  minChars: 3, 
		  indicator: 'indicator1',
		  afterUpdateElement : getSelectionId
		  }
		 );
		 return autoObject;
	}
	
	var autocompleteObject = autocomplete_initialize();
		 
	function getSelectionId(text, li) {
	   landmark_name_selected = $("landmark_name_selected");
	   landmark_name_selected.value = li.id;
		   //alert (li.id);
	}