function closeSelect() {
  if ( !document.getElementsByName("select_menu") ) { return false; }

  for (var i in document.getElementsByName("select_menu")) {
      document.getElementsByName("select_menu")[i].style.visibility="hidden"; 
  }
	

}

function openSelect() {

  if ( !document.getElementsByName("select_menu") ) { return false; }
  var str;
  for (var i in document.getElementsByName("select_menu")) {
      document.getElementsByName("select_menu")[i].style.visibility="visible"; 
  } 
	
}