@@ -, +, @@ 
        high number)
  a number field
  (note, you can test the pattern but when clicking done you will be
   prevented from)
---
 .../intranet-tmpl/prog/en/modules/serials/subscription-add.tt   | 2 +-
 .../prog/en/modules/serials/subscription-numberpatterns.tt      | 2 +-
 .../intranet-tmpl/prog/en/modules/serials/subscription-renew.tt | 2 +-
 3 files changed, 3 insertions(+), 3 deletions(-)
--- a/koha-tmpl/intranet-tmpl/prog/en/modules/serials/subscription-add.tt	
+++ a/koha-tmpl/intranet-tmpl/prog/en/modules/serials/subscription-add.tt	
@@ -346,7 +346,7 @@ fieldset.rows table { clear: none; margin: 0; }
                                                 </option>
                                             [% END %]
                                         </select>
-                                        <input type="text" name="sublength" id="sublength" value="[% sublength | html %]" size="3" /> (enter amount in numerals)
+                                        <input name="sublength" id="sublength" value="[% sublength | html %]" size="6" type=number min=0 max=2000 />
                                         <input type="hidden" name="issuelengthcount">
                                     </li>
                                     <li>
--- a/koha-tmpl/intranet-tmpl/prog/en/modules/serials/subscription-numberpatterns.tt	
+++ a/koha-tmpl/intranet-tmpl/prog/en/modules/serials/subscription-numberpatterns.tt	
@@ -203,7 +203,7 @@ 
                     <option value="weeks">weeks</option>
                     <option value="months">months</option>
                   </select>
-                  <input type="text" id="sublength" size="3" />
+                  <input type="number" id="sublength" size="6"  min=0 max=2000 />
                 </li>
                 <li>
                   <label for="locale">Locale: </label>
--- a/koha-tmpl/intranet-tmpl/prog/en/modules/serials/subscription-renew.tt	
+++ a/koha-tmpl/intranet-tmpl/prog/en/modules/serials/subscription-renew.tt	
@@ -80,7 +80,7 @@ 
             </option>
         [% END %]
     </select>
-    <input type="text" name="sublength" id="sublength" size="3" value="[% subscription.numberlength || subscription.weeklength || subscription.monthlength | html %]" />(enter amount in numerals)
+    <input type="number" name="sublength" id="sublength" size="6" value="[% subscription.numberlength || subscription.weeklength || subscription.monthlength | html %]" min=0 max=2000 />
     <input type="hidden" name="issuelengthcount">
     </li>
 
--