function set_price_info_text(id, tekststreng) {
  $("#"+id).bt (
		     tekststreng,
		     {
			     trigger: 'hover',
			     cornerRadius: 5,
			     fill: '#fff',
			     positions: 'top',
			     strokeWidth: 1,
			     strokeStyle: 'black',
			     spikeLength: 0,
			     spikeGirth: 0
			     }
		     );
}