function displayPopis(element)
{
    var pcka = element.getElementsByTagName('p');
    for (var i=0; i <= (pcka.length-1); i++)
	{
	    if (pcka[i].className=="popisHidden") 
        {
            pcka[i].className="popisVisible";
        } 
	}
    return;
}

function hidePopis(element)
{
    var pcka = element.getElementsByTagName('p');
    for (var i=0; i <= (pcka.length-1); i++)
	{
	    if (pcka[i].className=="popisVisible") 
        {
            pcka[i].className="popisHidden";
            return;
        } 
	}
}