function focus() {
	document.getElementById('focus').focus();
}

function confirm_delete() {
	return confirm('Opravdu chcete vymazat tuto položku z databáze?');
}

function showpopup($id) {
      document.getElementById($id + '-popup').style.visibility = 'visible';
}
    
function hidepopup($id) {
      document.getElementById($id + '-popup').style.visibility = 'hidden';
}