<s1ws:form action="results.jsp" > ... </s1ws:searchForm>
This creates an HTML form tag <form name="searchform" action="results.jsp" method="GET"> along with two hidden inputboxes:
A hidden inputbox for starting index named "si" with a value from the "si" parameter or default 1, and
A hidden inputbox for number of records per page named "ns" with a value from the ns parameter or default 20.