var current = 0;

$('tabs').firstDescendant().className += ' active-tab';

var active_tab = $('tabs').firstDescendant().firstDescendant().firstDescendant();

var motion = false;

function move_to(to, el){    

  if (!motion) {if (active_tab != el) {

el.parentNode.parentNode.className += ' active-tab';

   

active_tab.parentNode.parentNode.className = 'corner-left-top';

   }

   active_tab = el;    

move = (current - to)*730;

new Effect.Move($('tabber'), { x: move, beforeStart:function(){ motion = true;},afterFinish:function(){motion = false;}});

current = to;

  }

}