var Tab = new Class(
{
   initialize: function(id, class1, class2)
   {
      this.cid = id;
      this.class1 = class1;
      this.class2 = class2;
      //window.addEvent('domready', function(){new Roll(id);});
   },

   tabSwitch: function(n)
   {
   	  var tabs = $('tabs_' + this.cid).getElementsByTagName('SPAN');
   	  var panels = $('panels_' + this.cid).getChildren();
   	  for (var i = 0; i < tabs.length; i++)
   	  {
   	   	 tabs[i].className = this.class2;
   	   	 panels[i].style.display = 'none';
   	  }
   	  tabs[n].className = this.class1;
   	  panels[n].style.display = '';
   }
});