function img_change(id_img)
{
	s=document.images["img_"+id_img].src;
	if (s.indexOf("off")!=-1)
		document.images["img_"+id_img].src="/img/m_"+id_img+"_on.jpg";
	else
		document.images["img_"+id_img].src="/img/m_"+id_img+"_off.jpg";
}