function ShowHide(blok){
el=document.getElementById(blok).style;
el.display=(el.display == 'block')?'none':'block';
}

function Show(blok){
el=document.getElementById(blok).style;
el.display=(el.display == 'block')?'block':'block';
}

function Hide(blok){
el=document.getElementById(blok).style;
el.display=(el.display == 'block')?'none':'none';
}