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Index: moodle/lib/javascript-static.js
--- moodle/lib/javascript-static.js Base (1.39.2.5)
+++ moodle/lib/javascript-static.js Locally Modified (Based On 1.39.2.5)
@@ -138,10 +138,41 @@
     }
 }
 
+/**
+ * Set the hidden state of the 'virtual form element' with a particular name.
+ * This abstracts away the difference between a normal form element, like a select
+ * which is a single HTML element with a .value property, and a set of radio
+ * buttons, which is several HTML elements.
+ *
+ * @param form a HTML form.
+ * @param master the name of an element in that form.
+ * @param hidden the hidden state to set.
+ */
+function set_form_element_hidden(form, name, hidden) {
+    var element = form[name];
+    if (!element) {
+        return;
+    }
+    if (element.tagName) {
+        var el = findParentNode(element, 'DIV', 'fitem', false);
+        if (el!=null) {
+            el.style.display = hidden ? 'none' : '';
+        }
+    }
+    // Array of things, like radio buttons.
+    for (var j = 0; j < element.length; j++) {
+        var el = findParentNode(element[j], 'DIV', 'fitem', false);
+        if (el!=null) {
+            el.style.display = hidden ? 'none' : '';
+        }
+    }
+}
+
 function lockoptionsall(formid) {
     var form = document.forms[formid];
     var dependons = eval(formid + 'items');
     var tolock = [];
+    var tohide = [];
     for (var dependon in dependons) {
         // change for MooTools compatibility
         if (!dependons.propertyIsEnumerable(dependon)) {
@@ -153,6 +184,7 @@
         for (var condition in dependons[dependon]) {
             for (var value in dependons[dependon][condition]) {
                 var lock;
+                var hide = false;
                 switch (condition) {
                   case 'notchecked':
                       lock = !form[dependon].checked; break;
@@ -162,6 +194,9 @@
                       lock = form[dependon].selectedIndex == -1; break;
                   case 'eq':
                       lock = get_form_element_value(form, dependon) == value; break;
+                  case 'hide':
+                      // hide as well as disable
+                      hide = true; break;
                   default:
                       lock = get_form_element_value(form, dependon) != value; break;
                 }
@@ -171,6 +206,9 @@
                         continue;
                     }
                     var eltolock = dependons[dependon][condition][value][ei];
+                    if (hide) {
+                        tohide[eltolock] = true;
+                    }
                     if (tolock[eltolock] != null) {
                         tolock[eltolock] = lock || tolock[eltolock];
                     } else {
@@ -186,7 +224,10 @@
             continue;
         }
         set_form_element_disabled(form, el, tolock[el]);
+        if (tohide.propertyIsEnumerable(el)) {
+            set_form_element_hidden(form, el, tolock[el]);
     }
+    }
     return true;
 }