function show( item ) {
    var obj = document.getElementById( item );
    var lnk = document.getElementById( 'a_' + item );
    obj.style.display = "block";
    lnk.className = 'hide';
    lnk.href = 'javascript:hide(\'' +item + '\');';
}

function hide( item ) {
    var obj = document.getElementById( item );
    var lnk = document.getElementById( 'a_' + item );
    obj.style.display = "none";
    lnk.className = 'show';
    lnk.href = 'javascript:show(\'' +item + '\');';
}

function showpic( pic ) {
    var workbox = document.getElementById( 'forpics' );
    workbox.style.display       = "block";
    workbox.style.background    = "url('images/transparent.gif')" ;
    workbox.style.width         = "100%" ;
    workbox.style.height        = "100%" ;
    workbox.style.position      = "absolute" ;
    workbox.style.zIndex        = "10000" ;
    workbox.style.left          = "0" ;
    workbox.style.top           = "0" ;
    workbox.style.paddingTop    = "20px" ;
    workbox.innerHTML           = '<a title="bezár" href="javascript:hidepic();"><img style="border: 20px solid white;" src="pictures/'+pic+'" align="center" /></a>';

}

function hidepic( pic ) {
    var workbox = document.getElementById( 'forpics' );
    workbox.style.display       = "none";
    workbox.innerHTML = '' ;
}