var state = 'none';

function openclose( layer_ref, s )
{
	if(s) {
		state=s;
	} else {
		state = (state=='block') ? 'none' : 'block';
	}

  if( document.all ) { //IS IE 4 or 5 (or 6 beta)
    eval( "document.all." + layer_ref + ".style.display = state");
  }
  if( document.layers ) { //IS NETSCAPE 4 or below
    document.layers[layer_ref].display = state;
  }

  if( document.getElementById && !document.all ) {
    hza = document.getElementById( layer_ref );
    hza.style.display = state;
  }
}

function showhide( layer_ref, etat )
{
  if( etat == 'block' ) {
    var noetat = 'none';
  } else {
    var noetat = 'block';
  }

  if( document.all ) { //IS IE 4 or 5 or 6
    if( eval("document.all."+layer_ref+".style.display == '"+noetat+"'") ) {
      eval( "document.all." + layer_ref + ".style.display = '" + etat + "'" );
    }
  }
  if( document.layers ) { //IS netscape 4 or below
    if( document.layers[layer_ref].display == noetat ) {
      document.layers[layer_ref].display = etat;
    }
  }

  if( document.getElementById && !document.all ) {
    if( document.getElementById( layer_ref ).style.display == noetat ) {
      document.getElementById( layer_ref ).style.display = etat;
    }
  }
}