function potvrd_okno(ttext) {
    return window.confirm(ttext);
}

function kat_zs(kat) {
    
    if (document.getElementById('kat-in-'+kat).style.display == 'none')
        {
            document.getElementById('kat-in-'+kat).style.display='';
            //document.getElementById('kat-'+kat).style.backgroundImage='url('+img_minus+')';
            document.getElementById('kat-pm-'+kat).setAttribute('class','minus');
        }
    else
        {
            document.getElementById('kat-in-'+kat).style.display='none';
            //document.getElementById('kat-'+kat).style.backgroundImage='url('+img_plus+')';
            document.getElementById('kat-pm-'+kat).setAttribute('class','plus');

        }    

    
}