The Dink Network

I think this should solve it, not sure but think you need to make a loop back to forward to keep it continuing and for backward the same. Hope it works.

int &counter = 1;
forward:
sp_pframe(&sprite, &counter);
wait(100);
&counter += 1;
if (&counter == 11)
{
goto backward;
}
else
{
goto forward;
}

backward:
sp_pframe(&sprite, &counter);
wait(100);
&counter -= 1;
if (&counter == 1)
{
goto forward;
}
else
{
goto backward;
}