window.onload=function() {
upperTab.setup = {
   tabs: document.getElementById('disc-tab').getElementsByTagName('a'),
   pages: [
      document.getElementById('disc-box-2010'),
      document.getElementById('disc-box-2009'),
      document.getElementById('disc-box-2008'),
      document.getElementById('disc-box-2007'),
      document.getElementById('disc-box-2006'),
      document.getElementById('disc-box-2005'),
      document.getElementById('disc-box-2004'),
      document.getElementById('disc-box-2003'),
      document.getElementById('disc-box-2002'),
      document.getElementById('disc-box-2001')
      
   ]
}

upperTab.init();
}

var upperTab = {
   init: function(){
      var tabs = this.setup.tabs;
      var pages = this.setup.pages;
      
      for(i=0; i<pages.length; i++) {
         if(i !== 0) pages[i].style.display = 'none';
         tabs[i].onclick = function(){ upperTab.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[i].className = "selected";
         }
         else {
            pages[i].style.display = 'none';
            tabs[i].className = null;
         }

      }
   }
}