Submit form with multiple fields

Is it possible to cause a multi-field form to be submitted when the user
hits the enter key no matter which field on the form the cursor is in, if
the form has more than 2 fields?
Found so far:

<SCRIPT LANGUAGE="JavaScript"><!--
function submit1() {
document.useridForm.passwordField.value =
document.passwordForm.passwordField.value;
}

function submit2() {
document.passwordForm.useridField.value =
document.useridForm.useridField.value;
}
//--></SCRIPT>

<FORM NAME="useridForm" onSubmit="submit1()">
<P>Userid: <INPUT NAME="useridField" TYPE="TEXT">
<INPUT NAME="passwordField" TYPE="HIDDEN">

<SCRIPT LANGUAGE="JavaScript"><!--
document.write('</FORM><FORM NAME="passwordForm" onSubmit="submit2()">')
//--></SCRIPT>

<INPUT NAME="useridField" TYPE="HIDDEN">
<P>Password: <INPUT NAME="passwordField" TYPE="PASSWORD">

<P><INPUT TYPE="SUBMIT">
</FORM>