var evt = document.createEvent("KeyEvents");
evt.initKeyEvent(
"keypress",
true,
true,
null,
true, // holds Ctrl key
false, // holds Alt key
true, // holds Shift key
false, // holds Meta key
evt.DOM_VK_BACK_SLASH,// presses a special key, @see http://mxr.mozilla.org/mozilla/source/dom/public/idl/events/nsIDOMKeyEvent.idl
70 // presses a normal key, e.g. "A".charCodeAt(0),
);
document.documentElement.dispatchEvent(evt);