var visible;



function show(me)
{
 if(visible==null){
	visible=me;
	me.style.display="block";
	}else{
		if(visible==me)
		{
			visible.style.display="none";
			visible=null;
		}else{
			visible.style.display="none";
			 me.style.display="block";
			 visible=me;
		}
	}
}