I think you mistake understand XOOPS template system.
You need change template by template manager in copy of template set. Never to change in templates/eguide_admin.html file.

Follow as Altsys modules template manager result for change example.
@@ -238,9 +238,9 @@
 <script type="text/javascript">
 <!--//
 
 // display only JavaScript enable
-xoopsGetElementById("itemhelper").style.display = "block";
+//xoopsGetElementById("itemhelper").style.display = "block";
 function addFieldItem() {
     var myform = window.document.evform;
     var item=myform.xelab.value;
     if (item == "") {
--
安冨　伸浩 (マイサイト管理人)