function toggle_visibility(id) {
	var e = document.getElementById(id);
	var img = document.getElementById('img'+id);
	if (e.style.display == 'table-row') {
		e.style.display = 'none';
   		img.src = '/images/icons/nyil_elore.png';
	} else {
	  	e.style.display = 'table-row';
	   	img.src = '/images/icons/nyil_le.png';
   }
}