Ok, so here's my code for submitting the form:
document.forms['formid'].submit();
The Form Target attribute is deprecated for the DocType I'm using -
http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd
and I really don't want to use a different DocType as a work around for something so simple - so what are my options for submitting to a new window?