dynamicJavascript VS staticJavascript

>I saw in a JSP page the following lines:

<html:javascript formName="registrationForm"
dynamicJavascript="true"
staticJavascript="false"/>
*
<script language="Javascript1.1" src="staticJavascript.jsp"></script>*


What is the purpose of using
<script language="Javascript1.1" src="staticJavascript.jsp"></script> ?

http://jakarta.apache.org/struts/userGuide/struts-html.html#javascript