System Plugin: updated checkMonstraVersion function

plugins/box/system/system.admin.php

@@ -9,20 +9,33 @@
     /**
      * Check Monstra version
      */
-    function checkMonstraVersion() { 
+    function checkMonstraVersion() {
-        echo ('
+
+        if(!Session::exists('stable_monstra_version')){
+
+            preg_match('/"version" : "(.*)"/', CURL::get('http://monstra.org/api/version.php'), $version);
+
+            if(isset($version[1])){
+
+                $stable_version = $version[1];
+                Session::set('stable_monstra_version', $stable_version);
+
+            }
+
+        }else{
+            $stable_version = Session::get('stable_monstra_version');
+        }
+
+        if(Core::VERSION < $stable_version){
+
+            echo ('
                 <script type="text/javascript">
-                    $.getJSON("http://monstra.org/api/version.php?jsoncallback=?",
+                      $("#update-monstra").addClass("alert").html("'.__("Published a new version of the :monstra", "system", array(":monstra" => "<a target='_blank' href='http://monstra.org/download'>Monstra</a>")).'");
-                        function(data){
-                            var current_monstra_version = "'.Core::VERSION.'";
-                            var stable_monstra_version = data.version;
-                            if (current_monstra_version < stable_monstra_version) {
-                                $("#update-monstra").addClass("alert").html("'.__("Published a new version of the :monstra", "system", array(":monstra" => "<a target='_blank' href='http://monstra.org/download'>Monstra</a>")).'");
-                            }
-                        }
-                    );
                 </script> 
-        '); 
+            ');
+
+        }
+
     }
 
     class SystemAdmin extends Backend {