LSP: explain IH-system on login page untill turned off through localStorage (if browser supports)

lsp/main.css

@@ -90,7 +90,10 @@ body {
 #message > a {
   text-decoration: underline;
   color: #505050;
+}
+a {
   cursor: pointer;
+  text-decoration: underline;
 }
 #ih-button, #ih-button.active:hover {
   position: absolute;

lsp/main.js

@@ -1455,10 +1455,8 @@ $(function(){
   
   
   $('#ih-button').click(function(){
-    if (ih) {
-      $('.ih-balloon').remove();
-    }
-    else {
+    $('.ih-balloon').remove();
+    if (!ih) {
       getWikiData('/wiki/Integrated_Help',function(data){
         settings.ih = { 
           raw: data.find('#mw-content-text').contents(),
@@ -1498,4 +1496,13 @@ $(window).on('hashchange', function(e) {
     showTab(loc[0]);
   }
   ignoreHashChange = false;
-});
+});
+
+function localStorageSupported() {
+  //does this browser support it?
+  try {
+    return 'localStorage' in window && window['localStorage'] !== null;
+  } catch (e) {
+    return false;
+  }
+}

lsp/pages.js

@@ -68,6 +68,24 @@ function showTab(tabName,streamName) {
         $('#server').val(adr[1]);
         $('#credentials-username').val(adr[0]);
       }
+      
+      //new here? message
+      if ((!localStorageSupported) || (!localStorage['MistServer_notnew'])) {
+        var $msg = $('<div>').addClass('ih-balloon').addClass('pageinfo').html(
+            '<p>New here?<br>Click the Integrated Help logo for more information about the current page.</p>'
+        );
+        if (localStorageSupported()) {
+          $msg.append(
+            $('<a>').text('Don\'t show this again.').click(function(){
+              localStorage['MistServer_notnew'] = 1;
+              $(this).closest('.ih-balloon').remove();
+            })
+          );
+        }
+        $('#page').prepend($msg);
+      }
+
+      
     break;
     case 'create new account':
       $('#menu').css('visibility', 'hidden');