function setTopTab(tabname) {
  var i, a, main;
  for(i=0; (a = document.body.getElementsByTagName("li")[i]); i++) {
    if(a.className != ''){
	    a.className = "taboff";
      if(a.getAttribute("id") == tabname) {
      	a.className = "tabon";
      }
    }
  }
}
function getActiveTab() {
  var i, a;
  for(i=0; (a = document.body.getElementsByTagName("li")[i]); i++) {
    if(a.className == 'tabon') {
  		 return a.getAttribute("id");
  	}
  }
  return null;
}
function getPreferredTab() {
  var i, a;
  for(i=0; (a = document.body.getElementsByTagName("li")[i]); i++) {
    if(a.className != 'tabon') {
    	 return a.getAttribute("id");
    }
  }
  return null;
}
function createCookie(name,value,days) {
  if (days) {
    var date = new Date();
    date.setTime(date.getTime()+(days*24*60*60*1000));
    var expires = "; expires="+date.toGMTString();
  }
  else expires = "";
  document.cookie = name+"="+value+expires+"; path=/";
}
function readCookie(name) {
  var nameEQ = name + "=";
  var ca = document.cookie.split(';');
  for(var i=0;i < ca.length;i++) {
    var c = ca[i];
    while (c.charAt(0)==' ') c = c.substring(1,c.length);
    if (c.indexOf(nameEQ) == 0) return c.substring(nameEQ.length,c.length);
  }
  return null;
}
window.onunload = function(e) {
  var tabname = getActiveTab();
  createCookie("tabstyle", tabname, 365);
}
var cookie = readCookie("tabstyle");
var tabname = cookie ? cookie : getPreferredTab();
setTopTab(tabname);