// Banner image
function banner_corners() {
  // NOTE: Empirically, the default radius is 10px.
  $('.banner').corner('tl');
  $('.banner-border').corner();
  // IE doesn't support corner on images, so just catch the exception.
  try {
    $('.banner-image').corner('8px');
  } catch(e) {}
}

// select which banner image to show
var index = new Date().getMilliseconds() % num_banners; // cheap-o random
                                                        // number generator
var banner_img_id = '#b'+index;

// Center panel nav tabs
var div_ids = ['news', 'cal', 'rides', 'gear'];
function switch_panel(panel) {
  new_panel = document.getElementById(panel);
  for (var i = 0; i < div_ids.length; ++i) {
    var panel_id = div_ids[i];
    var s = document.getElementById(panel_id).style;
    if (s.display == '') {
      s.display = 'none';
      var old_tab = document.getElementById(panel_id + '-tab');
      old_tab.className = 'cp-nav unselected';
      break;
    }
  }
  new_panel.style.display = '';
  var new_tab = document.getElementById(panel + '-tab');
  new_tab.className = 'cp-nav selected';
}