function selectTab(showContent, selfObj) {
  var tabs = document.getElementById("tabs").getElementsByTagName("li");
  for (i = 0; i < tabs.length; i++) {
    tabs[i].className = "";
  }
  selfObj.parentNode.className = "selectTab";
  for (i = 0; j = document.getElementById("tabContent" + i); i++) {
    j.style.display = "none";
  }
  document.getElementById(showContent).style.display = "block";
}