void setJSHTMLBodyElementOnbeforeunload(ExecState* exec, JSObject* thisObject, JSValue value)
{
    UNUSED_PARAM(exec);
    HTMLBodyElement* imp = static_cast<HTMLBodyElement*>(static_cast<JSHTMLBodyElement*>(thisObject)->impl());
    imp->setOnbeforeunload(createJSAttributeEventListener(exec, value, thisObject));
}