/**
 * Toggles the current tab in display.
 */
function toggleTab(id) {
  if (!id) id = 1;
  var tabtitle = document.getElementById("tab-title-bar");
  if (tabtitle) {
    var links = tabtitle.getElementsByTagName("a");
    for (var i = 0; i < links.length; i++) {
      if (links[i].name && links[i].name != ('tab' + id)) {
        var content = document.getElementById("tabcontent" + (i+1));
        if (content) {
          content.style.display = "none";
	      links[i].className = "";
        }
      }
      else {
        links[i].className = "selected";
      }
    }
    var tbcont = document.getElementById("tabcontent" + id);
    if (tbcont) tbcont.style.display = "block";
  }
}

/**
 * Displays the first tab once the page has loaded.
 */
function initTabs() { toggleTab(1); }
if (window.attachEvent) { window.attachEvent("onload", initTabs); } 
else { window.addEventListener("load", initTabs, false); }