function whatbrowser() {
  if(document.layers) {
    thisbrowser="NN4";
  }
  if(document.all) {
    thisbrowser="ie"
  }
  if(!document.all && document.getElementById) {
    thisbrowser="NN6";
  }
  return thisbrowser;
}

function show(object) {
  var thisbrowser = whatbrowser();
  if(thisbrowser == "NN4"  && document.layers[object] != null) {
    document.layers[object].visibility = 'visible';
  } else if(thisbrowser == "ie") {
    document.all[object].style.visibility = 'visible';
  } else if(thisbrowser == "NN6") {
    document.getElementById(object).style.visibility='visible';
  }
  return true;
}

function hide(object) {
  var thisbrowser = whatbrowser();
  if(thisbrowser == "NN4"  && document.layers[object] != null) {
    document.layers[object].visibility = 'hidden';
  } else if(thisbrowser == "ie") {
    document.all[object].style.visibility = 'hidden';
  } else if(thisbrowser == "NN6") {
    document.getElementById(object).style.visibility='hidden';
  } 
  return true;
}