function openChildren(thisid, divid){
  if (document.getElementById(divid).style.display=="block"){
    document.getElementById(divid).style.display="none";
    document.getElementById(thisid).style.backgroundImage="url(/images/backgrounds/menu_item.png)";
  }else{
    document.getElementById(divid).style.display="block";
    document.getElementById(thisid).style.backgroundImage="url(/images/backgrounds/menu_item_selected.png)";
  }
}