Problem with form or servlet???

Question

hello..
i am trying to send some form data to a servlet for processing..
here is the code for the form
<table border="0">
<form action="details.upd" method="post" name="upd">
<tr><td>Username</td><td><input name="uname" type="text" size="25" maxlength="30"
value=<%=session.getAttribute("user") %> /></td>
</tr>
     <tr>
<td>password</td><td><input name="pass" type="password" size="25" maxlength="30" />
</td></tr>
<tr><td>confirm password</td><td><input name="pass2" size="25" maxlength="30" type="password"/></td></tr>
<tr><td>Email</td><td><input name="mail" type="text" size="25" maxlength="30"
value=<%=session.getAttribute("EMAIL") %> /></td></tr>
<tr><td align="center"><input name="submit" type="button" value="Update" /></td></tr>
<tr><td align="center"><input name="ch" type="hidden" value="det"/></td></tr>
</form>
</table>
here is the web.xml entry for my compiled servlet
<servlet>
<servlet-name>update</servlet-name>
<description>
Servlet used for updates sent from landlord sessions
</description>
<servlet-class>UpdateServlet</servlet-class>
<load-on-startup>5</load-on-startup>
</servlet>
     <servlet-mapping>
<servlet-name>update</servlet-name>
<url-pattern>*.upd</url-pattern>
</servlet-mapping>
the problem is that when i click the submit button to send the data, nothing happens....absolutely nothing. the page just stays as it is...please can u spot any fatal error in the code?
I have looked and looked without success..please help

Answer 1

yeah..i solved that.. but now i am getting another
problem...
why does this code...
Stringuser=(String)session.getAttribute("user");
gives me a class cast exception????
please helpBecause the object named "user" in your session isn't
a String.ok...thks