var current = 0;
if ($('tabs'))
{
	$('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)*546;
	new Effect.Move($('tabber'), { x: move, beforeStart:function(){ motion = true;},afterFinish:function(){motion = false;}});
	current = to;
	  }
	}
}