diff --git a/lib/assets/javascripts/home/index.js b/lib/assets/javascripts/home/index.js
index c4b0564..7743d7c 100644
--- a/lib/assets/javascripts/home/index.js
+++ b/lib/assets/javascripts/home/index.js
@@ -28,5 +28,5 @@
   $("#shibboleth-login").click(function(e){
     e.preventDefault();
     window.location.href = $(this).attr('href');
-  })
+  });
 });
\ No newline at end of file
diff --git a/lib/assets/javascripts/plans/edit.js b/lib/assets/javascripts/plans/edit.js
index 492bc3a..a35e077 100644
--- a/lib/assets/javascripts/plans/edit.js
+++ b/lib/assets/javascripts/plans/edit.js
@@ -17,7 +17,7 @@
   toggleVisibility();
   
   function toggleVisibility(){
-    let test = $("#is_test").is(':checked');
+    var test = $("#is_test").is(':checked');
     // If the test checkbox is true then disable the visibility dropdown
     $("input[name='visibility']").attr('aria-disabled', test).attr('disabled', test);
   }
diff --git a/lib/assets/javascripts/plans/index.js b/lib/assets/javascripts/plans/index.js
index df4b4d6..e5ade02 100644
--- a/lib/assets/javascripts/plans/index.js
+++ b/lib/assets/javascripts/plans/index.js
@@ -1,8 +1,8 @@
 $(document).ready(function(){
   $("input[type='checkbox']").on('click, change', function(e){
-    let self = this;
-    let id = $(this).attr("id").replace("is_test-", "");
-    let params = {plan: {visibility: $(this).is(':checked') ? 'is_test' : 'privately_visible'}};
+    var self = this;
+    var id = $(this).attr("id").replace("is_test-", "");
+    var params = {plan: {visibility: $(this).is(':checked') ? 'is_test' : 'privately_visible'}};
 
     // Update the visbility to test or private
     $.post("/plans/" + id + "/visibility", params, function(data){
diff --git a/lib/assets/javascripts/registrations/sign_in_sign_up.js b/lib/assets/javascripts/registrations/sign_in_sign_up.js
index 9e28fb2..7588491 100644
--- a/lib/assets/javascripts/registrations/sign_in_sign_up.js
+++ b/lib/assets/javascripts/registrations/sign_in_sign_up.js
@@ -1,26 +1,4 @@
 $(document).ready(function(){
-  
-  $(".tab-panels div.tab-panel:not(.active)").hide();
-  
-  $(".tabs li a").click(function(e){
-    e.preventDefault();
-    
-    // Make the clicked tab the active tab
-    $(this).parent().addClass('active');
-    $(this).attr('aria-selected', 'true');
-    $.each($(this).parent().siblings(), function(i, sib){
-      $(sib).removeClass('active');
-      $(sib).find('> a').attr('aria-selected', 'false');
-    });
-    
-    // Make the corresponding panel visible and the others hidden
-    let panel = $($(this).attr("href"));
-    panel.show().attr("aria-hidden", 'false');
-    $.each($(panel).siblings(), function(i, p){
-      $(p).hide().attr("aria-hidden", 'true');
-    });
-  });
-  
   // If the hidden valid-form field is set to true then enable the submit button
   $("#valid-form").change(function(){
     $(this).siblings(".form-submit").attr('aria-disabled', $(this).val() != "true");
@@ -42,12 +20,12 @@
 }
 
 function toggleSignInSubmit(){
-  let disabled = (validateEmail($("#user_email").val()) != '' || validatePassword($("#user_password").val()) != '');
+  var disabled = (validateEmail($("#user_email").val()) != '' || validatePassword($("#user_password").val()) != '');
   $("#sign-in-button").attr('aria-disabled', disabled);
 }
 
 function toggleRegisterSubmit(){
-  let disabled = ($("#user_firstname").val().trim().length <= 0 || 
+  var disabled = ($("#user_firstname").val().trim().length <= 0 || 
                   $("#user_surname").val().trim().length <= 0 || 
                   $("#user_email").val().trim().length <= 0 || 
                   $("#user_recovery_email").val().trim().length <= 0 || 
diff --git a/lib/assets/javascripts/roadmap-form.js b/lib/assets/javascripts/roadmap-form.js
index feff1b7..3adfd82 100644
--- a/lib/assets/javascripts/roadmap-form.js
+++ b/lib/assets/javascripts/roadmap-form.js
@@ -1,6 +1,6 @@
 // ---------------------------------------------------------------------------
 function toggleInputError(input, errorMessage){
-  let err = $(input).siblings("span.error-tooltip");
+  var err = $(input).siblings("span.error-tooltip");
   if(err.length <= 0){
     err = $(input).siblings("span.error-tooltip-right");
   }
diff --git a/lib/assets/javascripts/roadmap-tabs.js b/lib/assets/javascripts/roadmap-tabs.js
index 82f630f..3ac955b 100644
--- a/lib/assets/javascripts/roadmap-tabs.js
+++ b/lib/assets/javascripts/roadmap-tabs.js
@@ -10,7 +10,7 @@
     $(this).attr('aria-selected', 'true').parent().addClass('active');
 
     // Display the corresponding panel
-    let panel = $($(this).attr("href"));
+    var panel = $($(this).attr("href"));
     panel.show().attr("aria-hidden", 'false');
     $.each($(panel).siblings(), function(i, p){
       $(p).hide().attr("aria-hidden", 'true');
diff --git a/lib/assets/javascripts/roadmap-utils.js b/lib/assets/javascripts/roadmap-utils.js
index 70da96a..3297a5f 100644
--- a/lib/assets/javascripts/roadmap-utils.js
+++ b/lib/assets/javascripts/roadmap-utils.js
@@ -2,7 +2,7 @@
   // Allow for tabs to be selected if a user presses enter while on a tab
   $("li[role='tab']").keydown(function(ev) {
     if (ev.which ==13) {
-      $(this).click()
+      $(this).click();
     }
   });
 });
diff --git a/lib/assets/javascripts/shared/login_form.js b/lib/assets/javascripts/shared/login_form.js
index 0fe6822..a856804 100644
--- a/lib/assets/javascripts/shared/login_form.js
+++ b/lib/assets/javascripts/shared/login_form.js
@@ -20,7 +20,7 @@
   
     // Toggle the password field so that its visible/masked
     $("form.login-form #password_show").click(function(){
-      let typ = $("form.login-form #user_password").attr('type');
+      var typ = $("form.login-form #user_password").attr('type');
       $("form.login-form #user_password").attr('type', (typ === 'password' ? 'text' : 'password'));
     });
   
@@ -35,7 +35,7 @@
   
     // Display the submit button only if there is a valid email and password
     function toggleLogInSubmit(){
-      let disabled = (validateEmail($("form.login-form #user_email").val()) != '' || 
+      var disabled = (validateEmail($("form.login-form #user_email").val()) != '' || 
                       validatePassword($("form.login-form #user_password").val()) != '');
       $("form.login-form #sign-in-button").attr('aria-disabled', disabled);
     }
diff --git a/lib/assets/javascripts/shared/register_form.js b/lib/assets/javascripts/shared/register_form.js
index a33441b..8968c7b 100644
--- a/lib/assets/javascripts/shared/register_form.js
+++ b/lib/assets/javascripts/shared/register_form.js
@@ -12,7 +12,7 @@
   
     // Run the input validations when the focus changes
     $("form.register-form #user_email, form.register-form #user_recovery_email").on('blur change', function(){
-      let msg = validateEmail($(this).val().trim());
+      var msg = validateEmail($(this).val().trim());
       // If the standard email validation was successful validate that they do not match
       toggleInputError(this, (msg != '' ? msg : validateEmailsDoNotMatch()));
     });
@@ -22,7 +22,7 @@
   
     // Toggle the password field so that its visible/masked
     $("form.register-form #password_show").click(function(){
-      let typ = $("form.register-form #user_password").attr('type');
+      var typ = $("form.register-form #user_password").attr('type');
       $("form.register-form #user_password").attr('type', (typ === 'password' ? 'text' : 'password'));
     });
   
@@ -38,13 +38,13 @@
     $("form.register-form #password_show").attr("checked", false);
 
     function validateEmailsDoNotMatch(){
-      let email = $("form.register-form #user_email").val().trim();
-      let recovery = $("form.register-form #user_recovery_email").val().trim();
+      var email = $("form.register-form #user_email").val().trim();
+      var recovery = $("form.register-form #user_recovery_email").val().trim();
       return (email === recovery ? (email != '' ? __('Emails must be different') : '') : '');
     }
 
     function toggleRegisterSubmit(){
-      let disabled = ($("form.register-form #user_firstname").val().trim().length <= 0 || 
+      var disabled = ($("form.register-form #user_firstname").val().trim().length <= 0 || 
                       $("form.register-form #user_surname").val().trim().length <= 0 || 
                       validateEmail($("form.register-form #user_email").val()) != '' || 
                       validateEmail($("form.register-form #user_recovery_email").val()) != '' ||