diff --git a/lib/javascript-static.js b/lib/javascript-static.js
index 04155c3..0b1cfe3 100644
--- a/lib/javascript-static.js
+++ b/lib/javascript-static.js
@@ -138,10 +138,37 @@ function set_form_element_disabled(form, name, disabled) {
     }
 }
 
+/**
+ * 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) {
+        // TODO: currently a hack to get at the <div class="fitem"> that contains the control, two nodes up
+        element.parentNode.parentNode.style.display = hidden ? 'none' : '';
+    }
+    // Array of things, like radio buttons.
+    for (var j = 0; j < element.length; j++) {
+        var el = element[j];
+        el.parentNode.parentNode.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 +180,7 @@ function lockoptionsall(formid) {
         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 +190,9 @@ function lockoptionsall(formid) {
                       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 +202,9 @@ function lockoptionsall(formid) {
                         continue;
                     }
                     var eltolock = dependons[dependon][condition][value][ei];
+                    if (hide) {
+                        tohide[eltolock] = true;
+                    }
                     if (tolock[eltolock] != null) {
                         tolock[eltolock] = lock || tolock[eltolock];
                     } else {
@@ -186,6 +220,9 @@ function lockoptionsall(formid) {
             continue;
         }
         set_form_element_disabled(form, el, tolock[el]);
+        if (tohide.propertyIsEnumerable(el)) {
+            set_form_element_hidden(form, el, tolock[el]);
+        }
     }
     return true;
 }