如何用 Webbrowser 控件来点开 WebQQ 的登陆图标

在左面会有QQ的企鹅图标，但是我用了很多方法，都无法让 Webbrowser 去模拟点击那个QQ企鹅图标，来打开QQ登陆窗口，请教高手，100分相赠，谢谢大家了。

[DllImport("User32.Dll")]         public static extern long SetCursorPos(int x, int y);         [DllImport("user32.dll")]         public extern static void mouse_event(int dwFlags, int dx, int dy, int dwData, IntPtr dwExtraInfo);                 private void button2_Click(object sender, EventArgs e)         {             HtmlElement kk = webBrowser3.Document.GetElementById("alloy_icon_app_50_3");             Rectangle rect = kk.OffsetRectangle;             Point p = new Point(rect.Left + 40, rect.Top + 110);             p = this.PointToScreen(p);             SetCursorPos(p.X, p.Y);             mouse_event(6, 0, 0, 0, IntPtr.Zero);         }

可以在页面加载后直接调用它的应用：
webBrowser1.Document.InvokeScript("eval", new object[] { "qqweb.portal.runApp(50)" });