function moveMenuEntries(from,to){
  var content = $(from).contents();
  $(from).empty();
  $(to).append(content);
}

function moveAllMenuEntries(){
  moveMenuEntries('#mainmenu4_parking','#mainmenu4');
  moveMenuEntries('#mainmenu1_parking','#mainmenu1');
  moveMenuEntries('#mainmenu2_parking','#mainmenu2');
  moveMenuEntries('#mainmenu3_parking','#mainmenu3');
}