function visi(nr)
{
        if (document.layers)
        {
                vista = (document.layers[nr].visibility == 'hide') ? 'show' : 'hide'
                document.layers[nr].visibility = vista;
        }
        else if (document.all)
        {
                vista = (document.all[nr].style.visibility == 'hidden') ? 'visible'     : 'hidden';
                document.all[nr].style.visibility = vista;
        }
        else if (document.getElementById)
        {
                vista = (document.getElementById(nr).style.visibility == 'hidden') ? 'visible' : 'hidden';
                document.getElementById(nr).style.visibility = vista;

        }
}

function blocking(nr)
{
        if (document.layers)
        {
                current = (document.layers[nr].display == 'block') ? 'none' : 'block';
                document.layers[nr].display = current;
        }
        else if (document.all)
        {
                current = (document.all[nr].style.display == 'block') ? 'none' : 'block';
                document.all[nr].style.display = current;
        }
        else if (document.getElementById)
        {
                vista = (document.getElementById(nr).style.display == 'block') ? 'none' : 'block';
                document.getElementById(nr).style.display = vista;
        }
}

function MM_callJS(jsStr) { //v2.0
  return eval(jsStr)
}