I have re-instated the onclick to transfer the French text for re translation.
The original text is transferred onkeyup for translation to French.
This pausing does seem to have solved the problem.
Once the text has been translated to French, I can transfer it to frame3.
It appears in frame3 and is translated back into English almost instantly.
At the moment I have a problem with the translation into French..... it is extremely slow.
I rebooted, but nothing changed and anyway, the reverse translation is almost instant.
I'm gonna check the code again.
But what does seem clear, is that the system struggles to simultaneously translate English to French & French back into English; at least, in the way it was coded.