Minor layout fixes, basic schematic entry support, XPath for XML. Login page has…

Minor layout fixes, basic schematic entry support, XPath for XML. Login page has better types for input elements.

create_account.html

+<!-- TODO: Add pattern field to username. See HTML5 cookbook, 
+     page 84 for details-->
 <div name="enroll_form" id="enroll_form">
 <form name="login"  method="get">
 <%
@@ -10,12 +12,12 @@
 style="color:red;"><div id="enroll_error"
 name="enroll_error"></div></td></tr>
 <tr><td align=right>E-mail</td><td><input name="email" id="ca_email"
-type="text"> </td><td></td></tr>
+type="email" required> </td><td></td></tr>
 <tr><td align=right>Password</td><td><input name="password"
-id="ca_password" type="password"> </td><td></td></tr>
+id="ca_password" type="password" required> </td><td></td></tr>
 
 <tr><td align=right>Public Name</td><td><input name="username"
-id="ca_username" type="text"> </td><td><span class="ui-icon ui-icon-help" id="spinner_nick" style="display:inline-block;"></td></tr>
+id="ca_username" type="text" required> </td><td><span class="ui-icon ui-icon-help" id="spinner_nick" style="display:inline-block;"></td></tr>
 <tr><td colspan=3 align=center><div style="display:none"
 id="sregion_nick">Nickname you'd like to use on forums. We recommend
 some variant of your real name (e.g. first name, last initial), but we
@@ -47,11 +49,11 @@ regions to focus on. </div></td></tr>
 
 <tr><td align=right><input name="terms_of_service"
 id="cb_terms_of_service" type="checkbox"
-value="terms_of_service"></td><td colspan=2>I agree to the Terms of
+value="terms_of_service" required></td><td colspan=2>I agree to the Terms of
 Service</td></tr>
 
 <tr><td align=right><input name="honor_code" id="cb_honor_code"
-type="checkbox" value="honor_code"></td><td colspan=2>I agree
+type="checkbox" value="honor_code" required></td><td colspan=2>I agree
 to:</td></tr>
 <tr><td colspan=3 align=center>
 <br>

login.html

@@ -4,8 +4,8 @@
 <table><tr><td>
 <form name="login" action="/login" method="get">
 <tr><td colspan=2 align=center><div id="login_error"></div></td></tr>
-<tr><td align=right>E-mail</td><td><input name="email" id="li_email" type="text"> </td></tr>
-<tr><td align=right>Password</td><td><input name="password" id="li_email" type="password">  </td></tr>
+<tr><td align=right>E-mail</td><td><input name="email" id="li_email" type="email" required> </td></tr>
+<tr><td align=right>Password</td><td><input name="password" id="li_password" type="password" required>  </td></tr>
 <!--tr><td align=right><input name="remember" type="checkbox" value="remember"></td><td>Remember me  </td></tr-->
 <tr><td align=right></td><td align=right><input name="submit" id="login_button" type="button" value="Log in">  </td></tr>
 </form>

problem.js

@@ -2,6 +2,7 @@ function ${ id }_load() {
    $('#main_${ id }').load('${ ajax_url }problem_get?id=${ id }', 
       function() {
         MathJax.Hub.Queue(["Typeset",MathJax.Hub]);
+	update_schematics();
 
 	$('#check_${ id }').click(function() {
 	  var submit_data={};

video.html

 <table>
-  <tr><td rowspan=13 colspan=4>
+  <tr><td rowspan=14 colspan=4>
       <div id="ytapiplayer">
 	You need Flash player 8+ and JavaScript enabled to view this video.
       </div>
@@ -16,6 +16,7 @@
 <tr><td width=15><span class="" onclick="">&nbsp;</span></td><td colspan=2 id=stt_p4 align=center><div id=std_p4 onclick="title_seek( 4);">&nbsp;</div></td></tr>
 <tr><td width=15><span class="" onclick="">&nbsp;</span></td><td colspan=2 id=stt_p5 align=center><div id=std_p5 onclick="title_seek( 5);">&nbsp;</div></td></tr>
 <tr><td width=15><span class="" onclick="">&nbsp;</span></td><td colspan=2 id=stt_p6 align=center><div id=std_p7 onclick="title_seek( 6);">&nbsp;</div></td></tr>
+<tr><td></td><td colspan=2><img src="/static/pixel.jpg" width=400 height=0></td></tr>
 <tr><td></td></tr>
 
 <tr><td width=15><span class="ui-icon ui-icon-play" onclick="play();"></span></td>
@@ -23,3 +24,4 @@
                <td width=500 colspan=4><div id=slider></div></td></tr>
 </table>
 <div align=right>0.75x 1x 1.25x 1.5x </div>
+