function showServiceMenu(id_box,cur_link)
{
	/* show cur elem */
	var lis = document.getElementById("service_menu").getElementsByTagName("A");
	for (var i=0; i<lis.length; i++) lis[i].className="";
	cur_link.className = 'cur';
	/* show text box */
	/* show cur elem */
	var lis = document.getElementById("text_boxes_small").getElementsByTagName("DIV");
	for (var i=0; i<lis.length; i++) 
	 if (lis[i].className=='text_box_small') lis[i].style.display='none';
	document.getElementById('tb_'+id_box).style.display='block';
}