//blocking
var supported = (document.getElementById || document.all);
if (supported) {
  var shown = new Array();
  for (var i=1;i<=7;i++) {
    shown[i+1] = false;
  }
}

function blocking(i) {
  if (!supported) {
    alert('This menu does not work in your browser.');
    return;
  }
  shown[i] = (shown[i]) ? false : true;
  current = (shown[i]) ? 'block' : 'none';
  if (document.getElementById) {
    document.getElementById('number'+i).style.display = current;
  }
  else if (document.all) {
    document.all['number'+i].style.display = current;
  }
}