/*-----------------------------------------------------------
 Original
 http://archiva.jp/web/javascript/tab-menu.html

 Customized by WWW WATCH
 http://hyper-text.org/archives/2007/09/javascript_tab.shtml
------------------------------------------------------------*/

/*--setup--*/
window.onload=function() {
  setTimeout(function() {
    tab.setup = {
      tabs: document.getElementById('tab').getElementsByTagName('li'),
      pages: [
        document.getElementById('tab01'),
        document.getElementById('tab02')
      ]
    }
    tab.init();
  }, 10);
}
/*--setup end--*/
var tab = {
   init: function(){
      var tabs = this.setup.tabs;
      var pages = this.setup.pages;
      var tab_id = location.search;
      if (tab_id != '') {
        tab_id = tab_id.slice(-1);
        tab_id = Number(tab_id);
        if (tab_id > pages.length) {
          tab_id = 0;
        } else {
          tab_id--;
        }
      } else {
        tab_id = 0;
      }
      for(i=0; i<pages.length; i++) {
         if(i !== tab_id) {
           pages[i].style.display = 'none';
         } else {
           tabs[i].className = 'selected';
         }
         tabs[i].onclick = function(){ tab.showpage(this); return false; };
      }
   },
   
   showpage: function(obj){
      var tabs = this.setup.tabs;
      var pages = this.setup.pages;
      var num;
      
      for(num=0; num<tabs.length; num++) {
         if(tabs[num] === obj) break;
      }
      
      for(var i=0; i<pages.length; i++) {
         if(i == num) {
            pages[num].style.display = 'block';
            tabs[num].className = 'selected';
         }
         else{
            pages[i].style.display = 'none';
            tabs[i].className = null;
         }
      }
   }
}