you can do it like this
page1.jsp:
<html>
<head><b>session 1</b></head>
<body>
<%
String emailbutton = (String) session.getAttribute("emailbutton");
%>
<form name="form1" method="post" action="page2.jsp">
email : <input type="text" name="emailbutton" value="<%= emailbutton%>">
<input type="submit" name="Submit" value="call">
</form>
</body>
</html>
page2.jsp:
<html>
<head><b>session 2</b></head>
<body>
<%
session.setAttribute("emailbutton",(String) request.getParameter("emailbutton"));
String emailbutton = (String) session.getAttribute("emailbutton");
String emailbutton2 = (String) sessin.getAttribute("emailbutton2");
%>
<form name="form1" method="post" action="page3.jsp">
<%
out.println("we get emailbutton:" + emailbutton + " from session");
%>
job : <input type="text" name="emailbutton2" value="<%= emailbutton2%>">
<input type="submit" name="Submit" value="call">
</form>
</body>
</html>