function $o(obj) {return document.getElementById(obj);}
function $vis(id,val,def) {$o(id).style.display=val?(def!=null?def:'block'):'none';}
function $chvis(id,def) {var o=$o(id);o.style.display=o.style.display=='none'?(def!=null?def:'block'):'none';}

// filtr na liscie
function setFilterExt() {
	var o=$o('slfilter');
	if (o.style.display=='none') o.style.display='block'; else o.style.display='none';
}

// edu
var lastselectedid = new Array(), lastselectedlength;
function showSub(id, org, pos) {
	var o = $o('dedu'+id);
	var t = o.getElementsByTagName('span')[0].innerHTML;
	if (id.length < 4) {
		o.parentNode.style.display = 'none';
		o = $o('dedu'+id+'0');
		try {o.style.display = 'block';} catch (e) {}
		$o('eduback').style.display='block';
	}
	if (org != -1 && id.length == 2) {$o('edusc').value=t;$o('eduschool').innerHTML = 'Wybrano:' + (pos=='e'?'':'<br/>') + '&nbsp;&raquo; '+t;}
	else if (org != -1 && id.length == 3) {$o('educl').value=t;$o('educlass').innerHTML = '&nbsp;&raquo; &nbsp; '+t;}
	else if (org != -1 && id.length >= 4) {$o('edusu').value=t;$o('edusubject').innerHTML = '&nbsp;&raquo; &nbsp; &nbsp; '+t;}
	lastselectedid[id.length] = id;
	if (org == 1) showSub(id + '1', -1);
	if (org != -1 && id.length < 4) {
		lastselectedlength = id.length; 
	}
}
function showBack() {
	$o('dedu'+lastselectedid[lastselectedlength]).parentNode.style.display = 'block';
	$o('dedu'+lastselectedid[lastselectedlength]+'0').style.display = 'none';
	try{$o('dedu'+lastselectedid[lastselectedlength+1]+'0').style.display = 'none';} catch (e) {}
	lastselectedlength = lastselectedid[lastselectedlength].length-1;
	if (lastselectedlength<2) {$o('eduback').style.display='none';$o('educlass').innerHTML = '';}
	if (lastselectedlength<3) $o('edusubject').innerHTML = '';
}
function showEdusearch2all() {
	$o('edusearch2allshow').style.display='none';
	$o('edusearch2all').style.display='block';
}