var state = 'block';

function sh() {
if (state == 'block') {
state = 'none';
}
else {
state = 'block';
}
if (document.getElementById) { // DOM3 = IE5, NS6
  dl=document.getElementsByName('arhdr');
  for(i=0;i<dl.length;i++){
    dl[i].style.display = state;
  }
}
else {
if (document.layers) { // Netscape 4
document.arhdr.display = state;
}
}
}