JSP is handled on the server side. So unless you want to "forward" the page before the user gets the page, you would need Client side scripting like JavaScript.
The JavaScript code would be something like:
Code:
<input type="button" value="Add" onClick="javascript:window.location='some.jsp';">
If you wanted the JSP to specify the page to "forward", you could have something like this;
Code:
<%
String myPage = "some.jsp";
%>
<input type="button" value="Add" onClick="javascript:window.location='<%= myPage %>';">
or something along those lines.