Heres an action script that i use.
function itemHandler5(obj, item){_quality = "high";}
function itemHandler6(obj, item){_quality = "medium";}
function itemHandler7(obj, item){_quality = "low";}
root_cm = new ContextMenu();
root_cm.hideBuiltInItems();
eee_cmi = new ContextMenuItem("High Quality", itemHandler5);
fff_cmi = new ContextMenuItem("Mid Quality", itemHandler6);
ggg_cmi = new ContextMenuItem("Low Quality", itemHandler7);
ccc_cmi.separatorBefore = true;
eee_cmi.separatorBefore = true;
root_cm.customItems.push(aaa_cmi, bbb_cmi, ccc_cmi, ddd_cmi, eee_cmi, fff_cmi, ggg_cmi);
_root.menu = root_cm;