function Panel(objMenu, objPlus) {
   if (objPlus.title == "+") {
       ExpandPanel(objMenu,objPlus);
   } else {
       CollapsePanel(objMenu,objPlus);
   }
}

function ExpandPanel(objMenu, objPlus) {
    objMenu.style.display = "";
    objPlus.innerHTML = "-";
    objPlus.title	   = "-";
}

function CollapsePanel(objMenu, objPlus) {
    objMenu.style.display = "none";
    objPlus.innerHTML = " ";
    objPlus.title	   = "+";
}

function ExpandCollapse(objMenu, objPlus) {
    if (objPlus.title == "+"){
        objPlus.innerHTML = "-";
        objPlus.title	   = "-";
        objMenu.style.display = "";
        ExpCol.innerHTML = "Collapse All";

        ExpandPanel(Menu, Plus_Menu)
        ExpandPanel(Chapters, Plus_Chapters)
   } else {
        objPlus.innerHTML = " ";
        objMenu.style.display = "none";
        CollapsePanel(Menu, Plus_Menu)
        CollapsePanel(Chapters, Plus_Chapters)
   }
}