function nova_jan(newwindow)
   {
      var desktop = window.open(newwindow,'new_window','toolbar=yes,location=yes,directories=yes,status=yes,scrollbars=yes,menubar=yes,resizable=yes');
   }
	function abremenu (a) {
		if (document.getElementById(a).style.display=='block'){
	   		document.getElementById(a).style.display='none';
	 	} else {
	   		document.getElementById(a).style.display='block';
		}
}