function showTeachers()
{
	$("sort_lan").style.display = "none";
	$("sort_teach").style.display = "block";
	$("un_sort_lan").style.display = "block";
	$("un_sort_teach").style.display = "none";
	$('spisok').style.display = "block";
	pars = "";
	var myAjax = new Ajax.Updater('spisok', "/classes/ajax/GetTeachers.php", {method: 'get', parameters: pars});
}
function showLanguages()
{
	$("sort_lan").style.display = "block";
	$("sort_teach").style.display = "none";
	$("un_sort_lan").style.display = "none";
	$("un_sort_teach").style.display = "block";
	$('spisok').style.display = "block";
	pars = "";
	var myAjax = new Ajax.Updater('spisok', "/classes/ajax/GetLanguages.php", {method: 'get', parameters: pars});
}

function slideDwn(id)
{
	new Effect.SlideDown('playlist' + id);
	$("slideDown" + id).style.display = "none";
	$("slideUp" + id).style.display = "block";
}
function slideU(id)
{
	new Effect.SlideUp('playlist' + id);
	$("slideUp" + id).style.display = "none";
	$("slideDown" + id).style.display = "block";
}
function showSong(id)
{
	$("sort_lan").style.display = "none";
	$("sort_teach").style.display = "none";
	$("un_sort_lan").style.display = "block";
	$("un_sort_teach").style.display = "block";
	$('spisok').style.display = "block";
	pars = "id=" + id;
	var myAjax = new Ajax.Updater('spisok', "/classes/ajax/GetSong.php", {method: 'get', parameters: pars});
}

function checkLogin()
{
	if ($("login").value == "")
	{
		$("login_alert").className = "set alert";
		return false;
	}
	return true;
}