function zarovnej(id){
	var h = document.getElementById(id).clientHeight;
	h = h - (h % 20) + 20;
	document.getElementById(id).style.height=h+'px';
}
function show(id){
        document.getElementById(id).style.display = 'block';
}
function hide(id){
        document.getElementById(id).style.display = 'none';
}