safe_mailto problem

[eluser]Perkin5[/eluser]
Further to my last, I now suspect it's not safe_mail itself that's the problem. Safe_mail writes javascript code that relies on the document write function (sorry I can't write that correctly as the forum doesn't allow it). I've tried using a test js script inside the codeigniter view and I can't get document write to work at all so obviously safe_mail or auto_mail will also not work.

What can be stopping it?