diff --git a/index.php b/index.php
index 7802d38..f98e367 100644
--- a/index.php
+++ b/index.php
@@ -2,6 +2,7 @@
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 require_once("{$CFG->libdir}/formslib.php");
 require_once($CFG->libdir . '/adminlib.php');
+require_once($CFG->libdir.'/tablelib.php');
 
 require_login();
 
diff --git a/yui/build/moodle-availability_examus-form/moodle-availability_examus-form-coverage.js b/yui/build/moodle-availability_examus-form/moodle-availability_examus-form-coverage.js
index a5f1879..741a19d 100644
--- a/yui/build/moodle-availability_examus-form/moodle-availability_examus-form-coverage.js
+++ b/yui/build/moodle-availability_examus-form/moodle-availability_examus-form-coverage.js
@@ -1,6 +1,6 @@
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+__cov_VkxrC3bnPgMAADDnSvyZqQ.s['1']++;YUI.add('moodle-availability_examus-form',function(Y,NAME){__cov_VkxrC3bnPgMAADDnSvyZqQ.f['1']++;__cov_VkxrC3bnPgMAADDnSvyZqQ.s['2']++;M.availability_examus=(__cov_VkxrC3bnPgMAADDnSvyZqQ.b['1'][0]++,M.availability_examus)||(__cov_VkxrC3bnPgMAADDnSvyZqQ.b['1'][1]++,{});__cov_VkxrC3bnPgMAADDnSvyZqQ.s['3']++;M.availability_examus.form=Y.Object(M.core_availability.plugin);__cov_VkxrC3bnPgMAADDnSvyZqQ.s['4']++;M.availability_examus.form.initInner=function(){__cov_VkxrC3bnPgMAADDnSvyZqQ.f['2']++;};__cov_VkxrC3bnPgMAADDnSvyZqQ.s['5']++;M.availability_examus.form.instId=1;__cov_VkxrC3bnPgMAADDnSvyZqQ.s['6']++;M.availability_examus.form.getNode=function(json){__cov_VkxrC3bnPgMAADDnSvyZqQ.f['3']++;__cov_VkxrC3bnPgMAADDnSvyZqQ.s['7']++;var html,node,root,id,strings;__cov_VkxrC3bnPgMAADDnSvyZqQ.s['8']++;strings=M.str.availability_examus;__cov_VkxrC3bnPgMAADDnSvyZqQ.s['9']++;id='examus'+M.availability_examus.form.instId;__cov_VkxrC3bnPgMAADDnSvyZqQ.s['10']++;M.availability_examus.form.instId+=1;__cov_VkxrC3bnPgMAADDnSvyZqQ.s['11']++;html='<label> '+strings.title+' </label><br>';__cov_VkxrC3bnPgMAADDnSvyZqQ.s['12']++;html+='<label for"'+id+'">'+strings.duration+'</label>';__cov_VkxrC3bnPgMAADDnSvyZqQ.s['13']++;html+='<input type="text" name="duration" id="'+id+'">';__cov_VkxrC3bnPgMAADDnSvyZqQ.s['14']++;node=Y.Node.create('<span> '+html+' </span>');__cov_VkxrC3bnPgMAADDnSvyZqQ.s['15']++;if(json.duration!==undefined){__cov_VkxrC3bnPgMAADDnSvyZqQ.b['2'][0]++;__cov_VkxrC3bnPgMAADDnSvyZqQ.s['16']++;node.one('input[name=duration]').set('value',json.duration);}else{__cov_VkxrC3bnPgMAADDnSvyZqQ.b['2'][1]++;}__cov_VkxrC3bnPgMAADDnSvyZqQ.s['17']++;if(!M.availability_examus.form.addedEvents){__cov_VkxrC3bnPgMAADDnSvyZqQ.b['3'][0]++;__cov_VkxrC3bnPgMAADDnSvyZqQ.s['18']++;M.availability_examus.form.addedEvents=true;__cov_VkxrC3bnPgMAADDnSvyZqQ.s['19']++;root=Y.one('.availability-field');__cov_VkxrC3bnPgMAADDnSvyZqQ.s['20']++;root.delegate('valuechange',function(){__cov_VkxrC3bnPgMAADDnSvyZqQ.f['4']++;__cov_VkxrC3bnPgMAADDnSvyZqQ.s['21']++;M.core_availability.form.update();},'.availability_examus input[name=duration]');}else{__cov_VkxrC3bnPgMAADDnSvyZqQ.b['3'][1]++;}__cov_VkxrC3bnPgMAADDnSvyZqQ.s['22']++;return node;};__cov_VkxrC3bnPgMAADDnSvyZqQ.s['23']++;M.availability_examus.form.fillValue=function(value,node){__cov_VkxrC3bnPgMAADDnSvyZqQ.f['5']++;__cov_VkxrC3bnPgMAADDnSvyZqQ.s['24']++;value.duration=node.one('input[name=duration]').get('value').trim();};__cov_VkxrC3bnPgMAADDnSvyZqQ.s['25']++;M.availability_examus.form.fillErrors=function(errors,node){__cov_VkxrC3bnPgMAADDnSvyZqQ.f['6']++;__cov_VkxrC3bnPgMAADDnSvyZqQ.s['26']++;var value={};__cov_VkxrC3bnPgMAADDnSvyZqQ.s['27']++;this.fillValue(value,node);__cov_VkxrC3bnPgMAADDnSvyZqQ.s['28']++;if((__cov_VkxrC3bnPgMAADDnSvyZqQ.b['5'][0]++,value.duration===undefined)||(__cov_VkxrC3bnPgMAADDnSvyZqQ.b['5'][1]++,!/^\d+$/.test(value.duration))||(__cov_VkxrC3bnPgMAADDnSvyZqQ.b['5'][2]++,value.duration%30!==0)){__cov_VkxrC3bnPgMAADDnSvyZqQ.b['4'][0]++;__cov_VkxrC3bnPgMAADDnSvyZqQ.s['29']++;errors.push('availability_examus:error_setduration');}else{__cov_VkxrC3bnPgMAADDnSvyZqQ.b['4'][1]++;}};},'@VERSION@',{'requires':['base','node','event','moodle-core_availability-form']});
diff --git a/yui/build/moodle-availability_examus-form/moodle-availability_examus-form-debug.js b/yui/build/moodle-availability_examus-form/moodle-availability_examus-form-debug.js
index 0f2048d..aeed238 100644
--- a/yui/build/moodle-availability_examus-form/moodle-availability_examus-form-debug.js
+++ b/yui/build/moodle-availability_examus-form/moodle-availability_examus-form-debug.js
@@ -33,9 +33,9 @@ M.availability_examus.form.getNode = function(json) {
 
     if (!M.availability_examus.form.addedEvents) {
         M.availability_examus.form.addedEvents = true;
-        root = Y.one('#fitem_id_availabilityconditionsjson');
+
+        root = Y.one(".availability-field");
         root.delegate('valuechange', function () {
-            // Trigger the updating of the hidden availability data whenever the password field changes.
             M.core_availability.form.update();
         }, '.availability_examus input[name=duration]');
     }
@@ -44,14 +44,14 @@ M.availability_examus.form.getNode = function(json) {
 };
 
 M.availability_examus.form.fillValue = function(value, node) {
-    value.duration = node.one('input[name=duration').get('value').trim();
+    value.duration = node.one('input[name=duration]').get('value').trim();
 };
 
 M.availability_examus.form.fillErrors = function(errors, node) {
     var value = {};
     this.fillValue(value, node);
 
-    if (value.duration === undefined || !/^\d+$/.test(value.duration) || value.duration % 30 != 0) {
+    if (value.duration === undefined || !/^\d+$/.test(value.duration) || value.duration % 30 !== 0) {
             errors.push('availability_examus:error_setduration');
     }
 };
diff --git a/yui/build/moodle-availability_examus-form/moodle-availability_examus-form-min.js b/yui/build/moodle-availability_examus-form/moodle-availability_examus-form-min.js
index f673249..e6326dd 100644
--- a/yui/build/moodle-availability_examus-form/moodle-availability_examus-form-min.js
+++ b/yui/build/moodle-availability_examus-form/moodle-availability_examus-form-min.js
@@ -1 +1 @@
-YUI.add("moodle-availability_examus-form",function(e,t){M.availability_examus=M.availability_examus||{},M.availability_examus.form=e.Object(M.core_availability.plugin),M.availability_examus.form.initInner=function(){},M.availability_examus.form.instId=1,M.availability_examus.form.getNode=function(t){var n,r,i,s,o;return o=M.str.availability_examus,s="examus"+M.availability_examus.form.instId,M.availability_examus.form.instId+=1,n="<label> "+o.title+" </label><br>",n+='<label for"'+s+'">'+o.duration+"</label>",n+='<input type="text" name="duration" id="'+s+'">',r=e.Node.create("<span> "+n+" </span>"),t.duration!==undefined&&r.one("input[name=duration]").set("value",t.duration),M.availability_examus.form.addedEvents||(M.availability_examus.form.addedEvents=!0,i=e.one("#fitem_id_availabilityconditionsjson"),i.delegate("valuechange",function(){M.core_availability.form.update()},".availability_examus input[name=duration]")),r},M.availability_examus.form.fillValue=function(e,t){e.duration=t.one("input[name=duration").get("value").trim()},M.availability_examus.form.fillErrors=function(e,t){var n={};this.fillValue(n,t),(n.duration===undefined||!/^\d+$/.test(n.duration)||n.duration%30!=0)&&e.push("availability_examus:error_setduration")}},"@VERSION@",{requires:["base","node","event","moodle-core_availability-form"]});
+YUI.add("moodle-availability_examus-form",function(e,t){M.availability_examus=M.availability_examus||{},M.availability_examus.form=e.Object(M.core_availability.plugin),M.availability_examus.form.initInner=function(){},M.availability_examus.form.instId=1,M.availability_examus.form.getNode=function(t){var n,r,i,s,o;return o=M.str.availability_examus,s="examus"+M.availability_examus.form.instId,M.availability_examus.form.instId+=1,n="<label> "+o.title+" </label><br>",n+='<label for"'+s+'">'+o.duration+"</label>",n+='<input type="text" name="duration" id="'+s+'">',r=e.Node.create("<span> "+n+" </span>"),t.duration!==undefined&&r.one("input[name=duration]").set("value",t.duration),M.availability_examus.form.addedEvents||(M.availability_examus.form.addedEvents=!0,i=e.one(".availability-field"),i.delegate("valuechange",function(){M.core_availability.form.update()},".availability_examus input[name=duration]")),r},M.availability_examus.form.fillValue=function(e,t){e.duration=t.one("input[name=duration]").get("value").trim()},M.availability_examus.form.fillErrors=function(e,t){var n={};this.fillValue(n,t),(n.duration===undefined||!/^\d+$/.test(n.duration)||n.duration%30!==0)&&e.push("availability_examus:error_setduration")}},"@VERSION@",{requires:["base","node","event","moodle-core_availability-form"]});
diff --git a/yui/build/moodle-availability_examus-form/moodle-availability_examus-form.js b/yui/build/moodle-availability_examus-form/moodle-availability_examus-form.js
index 0f2048d..aeed238 100644
--- a/yui/build/moodle-availability_examus-form/moodle-availability_examus-form.js
+++ b/yui/build/moodle-availability_examus-form/moodle-availability_examus-form.js
@@ -33,9 +33,9 @@ M.availability_examus.form.getNode = function(json) {
 
     if (!M.availability_examus.form.addedEvents) {
         M.availability_examus.form.addedEvents = true;
-        root = Y.one('#fitem_id_availabilityconditionsjson');
+
+        root = Y.one(".availability-field");
         root.delegate('valuechange', function () {
-            // Trigger the updating of the hidden availability data whenever the password field changes.
             M.core_availability.form.update();
         }, '.availability_examus input[name=duration]');
     }
@@ -44,14 +44,14 @@ M.availability_examus.form.getNode = function(json) {
 };
 
 M.availability_examus.form.fillValue = function(value, node) {
-    value.duration = node.one('input[name=duration').get('value').trim();
+    value.duration = node.one('input[name=duration]').get('value').trim();
 };
 
 M.availability_examus.form.fillErrors = function(errors, node) {
     var value = {};
     this.fillValue(value, node);
 
-    if (value.duration === undefined || !/^\d+$/.test(value.duration) || value.duration % 30 != 0) {
+    if (value.duration === undefined || !/^\d+$/.test(value.duration) || value.duration % 30 !== 0) {
             errors.push('availability_examus:error_setduration');
     }
 };
diff --git a/yui/src/form/js/form.js b/yui/src/form/js/form.js
index b20d3b0..c5cd3f9 100644
--- a/yui/src/form/js/form.js
+++ b/yui/src/form/js/form.js
@@ -31,9 +31,8 @@ M.availability_examus.form.getNode = function(json) {
 
     if (!M.availability_examus.form.addedEvents) {
         M.availability_examus.form.addedEvents = true;
-        root = Y.one('#fitem_id_availabilityconditionsjson');
+        root = Y.one(".availability-field");
         root.delegate('valuechange', function () {
-            // Trigger the updating of the hidden availability data whenever the password field changes.
             M.core_availability.form.update();
         }, '.availability_examus input[name=duration]');
     }
@@ -42,14 +41,14 @@ M.availability_examus.form.getNode = function(json) {
 };
 
 M.availability_examus.form.fillValue = function(value, node) {
-    value.duration = node.one('input[name=duration').get('value').trim();
+    value.duration = node.one('input[name=duration]').get('value').trim();
 };
 
 M.availability_examus.form.fillErrors = function(errors, node) {
     var value = {};
     this.fillValue(value, node);
 
-    if (value.duration === undefined || !/^\d+$/.test(value.duration) || value.duration % 30 != 0) {
+    if (value.duration === undefined || !/^\d+$/.test(value.duration) || value.duration % 30 !== 0) {
             errors.push('availability_examus:error_setduration');
     }
 };
\ No newline at end of file