function toggleGroup(ObjID)
{
  var btn = document.getElementById("btn_" + ObjID);
if(btn.innerHTML == '+')
{
btn.innerHTML = '-';
$$('span[id="div_'+ObjID+'"]').each(function(a) {
a.show();
});
}
else
{
btn.innerHTML = '+';
$$('span[id="div_'+ObjID+'"]').each(function(a) {
a.hide();
});

}

}