var compatible = false;

if (document &&
    document.styleSheets &&
    document.styleSheets[1] &&
    document.styleSheets[1].cssRules &&
    document.styleSheets[1].cssRules[8] &&
    document.styleSheets[1].cssRules[8].style) {
  compatible = true;
  hideAll();
}

function showAll()
{
  if (compatible) document.styleSheets[1].cssRules[8].style.visibility="visible";
}

function hideAll()
{
  if (compatible) document.styleSheets[1].cssRules[8].style.visibility="hidden";
}