anchor.diff:  						<td><input name="repeat_password" type="password"/></td>
   					</tr>
   					<tr>
  -						<td>Email (Optional):</td>
  +						<td>Email:</td>
   						<td><input name="email" type="text" value="<%= email == null ? "" : email %>"/></td>
   					</tr>
   					<tr>
  
positive.code: 
  			function submitform() {
  				var form = document.forms["registration"];
  				var username = form.elements["username"].value;
  				if (username.length < 6) {
  					showerror("Username must be at least 6 characters.");
  
negative.code: 					return;
  				}
  				var email = form.elements["email"].value;
  				if (email == null || email == '') {
  						showerror("Email address is required.");
  						return;
  				} else if (email.length > 0) {
  					var amp = email.indexOf("@");
  					var dot = email.lastIndexOf(".");
  					if (!(amp > 0 && dot > amp+1)) {
  						showerror("Invalid email address.");
  						return;
  					}
  				}
  				var organization = form.elements["organization"].value;
  				if (organization == null || organization == '') {
  					showerror("Organization is required.");
  					return;
  				}
  <% if (!request.isSecure()) { %>
  				if (!form.elements["disclaimer"].checked) {
  