function klik(idecko,id_a){
el=document.getElementById(idecko).style; 
el.display=(el.display == 'block')?'none':'block';
document.getElementById(id_a).innerHTML=(document.getElementById(id_a).innerHTML == 'Skrýt informace')?'Zobrazit další informace':'Skrýt informace';
}

function changemenu(){
cs=document.getElementById('leve-cs-menu').style; 
cs.display=(cs.display == 'none')?'block':'none';

main=document.getElementById('leve-main-menu').style; 
main.display=(main.display == 'block')?'none':'block';
}