hr=pElement->get_onclick(&index);
CComQIPtr<IDispatch> spDisp(index.pdispVal);
DISPID dispId = 0;
OLECHAR *szName= L"toString";
hr=spDisp->GetIDsOfNames(IID_NULL, &szName, 1, LOCALE_SYSTEM_DEFAULT, &dispId);
DISPPARAMS params;
memset(¶ms, 0, sizeof(params));
VARIANT varRet;
spDisp->Invoke(dispId, IID_NULL, LOCALE_SYSTEM_DEFAULT, DISPATCH_METHOD, ¶ms, &varRet, NULL, NULL);