function RB_showBlock(idName) {
  if (document.getElementById) tMenu = document.getElementById(idName).style;
  else if (document.all) tMenu = document.all(idName).style;
  tMenu.display = "block";
}

function RB_hideBlock(idName) {
  if (document.getElementById) tMenu = document.getElementById(idName).style;
  else if (document.all) tMenu = document.all(idName).style;
  tMenu.display = "none"
}

function RB_showLayer(idName){
  if (document.getElementById) document.getElementById(idName).style.visibility='visible';
  else if (document.all) document.all(idName).style.visibility='visible';
  else if (document.layers) document.layers[idName].visibility='show';
}

function RB_hideLayer(idName){
  if (document.getElementById) document.getElementById(idName).style.visibility='hidden';
  else if (document.all) document.all(idName).style.visibility='hidden';
  else if (document.layers) document.layers[idName].visibility='hidden';
}