Get inner browser window in IE6 and IE7

int hwndInt = myIntptr.ToInt32();
IntPtr hwnd = myIntptr;
while (hwndInt != 0)
{
hwndInt = hwnd.ToInt32();
GetClassName(hwndInt, sbc, 256);

if (sbc.ToString().IndexOf("TabWindowClass", 0) > -1)
{
hwnd = FindWindowEx(hwnd, IntPtr.Zero, "Shell DocObject View", IntPtr.Zero);
hwnd = FindWindowEx(hwnd, IntPtr.Zero, "Internet Explorer_Server", IntPtr.Zero);
break;
}

else if (sbc.ToString().IndexOf("Shell DocObject View", 0) > -1)
{
hwnd = FindWindowEx(hwnd, IntPtr.Zero, "Internet Explorer_Server", IntPtr.Zero);
break;
}
hwnd = GetWindow(hwnd, GW_HWNDNEXT);
}