function toggleNavigation(heading, list){
    try{
        //target = obj.nextSibling;
        target = document.getElementById(list);
        obj = document.getElementById(heading).firstChild;
        if(target.style.display == "none"){
           obj.style.backgroundPosition = "-10px 0px";
           target.style.display = "block";
        }else{
           obj.style.backgroundPosition = "0px 0px";
           target.style.display = "none";
        }
    }catch(e){alert(e);}
        
}
/*
function toggleFolder(obj){
         var my_parent = obj.parentNode;
         try{
            var spacer = my_parent.nextSibling;
            var box = spacer.nextSibling;          
          if(obj.nextSibling.firstChild.style.display == "none"){

                spacer.style.display = "block";
                box.style.display = "block"; 
                obj.nextSibling.firstChild.style.display = "block";
            }else{
                spacer.style.display = "none";
                box.style.display = "none"; 
                obj.nextSibling.firstChild.style.display = "none";              
            }
         }catch (e) {
           alert(e);
         }
}*/