diff --git a/module/common/model.php b/module/common/model.php
index a20090c471..2b02ef51ae 100644
--- a/module/common/model.php
+++ b/module/common/model.php
@@ -509,69 +509,48 @@ class commonModel extends model
         if(strpos('story, task, bug, testcase, doc', $type) === false) return $preAndNextObject;
         $table = $this->config->objectTables[$type];
 
-        $typeIDs = $type . 'IDs';
-        if($this->session->$typeIDs and strpos($this->session->$typeIDs, ',' . $objectID . ',') !== false)
+        /* Get objectIDs. */
+        $queryCondition    = $type . 'QueryCondition';
+        $typeOnlyCondition = $type . 'OnlyCondition';
+        $queryCondition = $this->session->$queryCondition;
+        $orderBy = $type . 'OrderBy';
+        $orderBy = $this->session->$orderBy;
+        $orderBy = str_replace('`left`', 'left', $orderBy); // process the `left` to left.
+
+        if(empty($queryCondition) or $this->session->$typeOnlyCondition)
         {
-            $objectIDs = $this->session->$typeIDs;
-            $this->session->set($typeIDs, '');
+            $objects = $this->dao->select('*')->from($table)
+                ->beginIF($queryCondition != false)->where($queryCondition)->fi()
+                ->beginIF($orderBy != false)->orderBy($orderBy)->fi()
+                ->fetchAll();
         }
         else
         {
-            /* Get objectIDs. */
-            $queryCondition    = $type . 'QueryCondition';
-            $typeOnlyCondition = $type . 'OnlyCondition';
-            $queryCondition = $this->session->$queryCondition;
-            $orderBy = $type . 'OrderBy';
-            $orderBy = $this->session->$orderBy;
-            $orderBy = str_replace('`left`', 'left', $orderBy); // process the `left` to left.
-
-            if(empty($queryCondition) or $this->session->$typeOnlyCondition)
-            {
-                $objects = $this->dao->select('*')->from($table)
-                    ->beginIF($queryCondition != false)->where($queryCondition)->fi()
-                    ->beginIF($orderBy != false)->orderBy($orderBy)->fi()
-                    ->fetchAll();
-            }
-            else
-            {
-                $objects = $this->dbh->query($queryCondition . " ORDER BY $orderBy")->fetchAll();
-            }
-
-            $tmpObjectIDs = array();
-            foreach($objects as $object) $tmpObjectIDs[$object->id] = (!$this->session->$typeOnlyCondition and $type == 'testcase' and isset($object->case)) ? $object->case : $object->id;
-            $objectIDs    = ',' . implode(',', $tmpObjectIDs) . ',';
-            $this->session->set($type . 'IDs', $objectIDs);
+            $objects = $this->dbh->query($queryCondition . " ORDER BY $orderBy")->fetchAll();
         }
 
+        $tmpObjectIDs = array();
+        foreach($objects as $key => $object) $tmpObjectIDs[$key] = (!$this->session->$typeOnlyCondition and $type == 'testcase' and isset($object->case)) ? $object->case : $object->id;
+        $objectIDs = array_flip($tmpObjectIDs);
+
         /* Current object. */
-        $currentStart = strpos($objectIDs, ',' . $objectID . ',') + 1;
-        $currentEnd   = $currentStart + strlen($objectID) - 1;
+        $currentKey = array_search($objectID, $tmpObjectIDs);
 
-        /* Get the previous object. */
-        $tmp      = substr($objectIDs, 0, $currentStart - 1);
-        $preStart = strrpos($tmp, ',', 0) +  1;
-        $preEnd   = $currentStart - 2;
-        if($preEnd - $preStart < 0) 
+        $preKey = $currentKey - 1;
+        $preAndNextObject->pre = '';
+        if($preKey >= 0) 
         {
-            $preAndNextObject->pre = '';
-        }
-        else
-        {
-            $preID = substr($objectIDs, $preStart, $preEnd - $preStart + 1);
-            $preAndNextObject->pre  = $this->dao->select('*')->from($table)->where('id')->eq($preID)->fetch();
+            $preID = $tmpObjectIDs[$preKey];
+            $preAndNextObject->pre = $objects[$objectIDs[$preID]];
         }
         
         /* Get the next object. */
-        $nextStart = $currentEnd + 2;            
-        $nextEnd   = strlen($objectIDs) > $nextStart ? strpos($objectIDs, ',', $nextStart) - 1 : 0;
-        if($nextEnd - $nextStart < 0) 
+        $nextKey = $currentKey + 1;
+        $preAndNextObject->next = '';
+        if($nextKey < count($tmpObjectIDs)) 
         {
-            $preAndNextObject->next = '';
-        }
-        else
-        {
-            $nextID = substr($objectIDs, $nextStart, $nextEnd - $nextStart + 1);
-            $preAndNextObject->next = $this->dao->select('*')->from($table)->where('id')->eq($nextID)->fetch();
+            $nextID = $tmpObjectIDs[$nextKey];
+            $preAndNextObject->next = $objects[$objectIDs[$nextID]];
         }
 
         return $preAndNextObject;
diff --git a/module/my/control.php b/module/my/control.php
index db59f1815f..fcd0ea9685 100644
--- a/module/my/control.php
+++ b/module/my/control.php
@@ -304,6 +304,7 @@ class my extends control
                 ->andWhere('t1.status')->ne('done')
                 ->andWhere('t3.status')->ne('done')
                 ->orderBy($orderBy)->page($pager)->fetchAll();
+            $this->loadModel('common')->saveQueryCondition($this->dao->get(), 'testcase', false);
         }
         elseif($type == 'donebyme')
         {
@@ -312,14 +313,15 @@ class my extends control
                 ->Where('t1.assignedTo')->eq($this->app->user->account)
                 ->andWhere('t1.status')->eq('done')
                 ->orderBy($orderBy)->page($pager)->fetchAll();
+            $this->loadModel('common')->saveQueryCondition($this->dao->get(), 'testcase');
         }
         elseif($type == 'openedbyme')
         {
             $cases = $this->dao->findByOpenedBy($this->app->user->account)->from(TABLE_CASE)
                 ->andWhere('deleted')->eq(0)
                 ->orderBy($orderBy)->page($pager)->fetchAll();
+            $this->loadModel('common')->saveQueryCondition($this->dao->get(), 'testcase');
         }
-        $this->loadModel('common')->saveQueryCondition($this->dao->get(), 'testcase');
         
         /* Assign. */
         $this->view->title      = $this->lang->my->common . $this->lang->colon . $this->lang->my->testCase;
diff --git a/module/testtask/control.php b/module/testtask/control.php
index b82ed32838..0916f50e0c 100644
--- a/module/testtask/control.php
+++ b/module/testtask/control.php
@@ -538,7 +538,6 @@ class testtask extends control
         $preCase  = '';
         $nextCase = '';
         $caseID   = $caseID ? $caseID : $run->case->id;
-        if($runID and $preAndNext->next) $preAndNext->next = $this->dao->select('*')->from(TABLE_TESTRUN)->where('`case`')->eq($preAndNext->next->id)->fetch();
         if($preAndNext->pre)
         {
             $preCase['runID']   = $runID ? $preAndNext->pre->id : 0;
@@ -585,8 +584,8 @@ class testtask extends control
         else
         {
             $this->testtask->batchRun($from);
-            $method = $from == 'testcase' ? 'browse' : 'cases';
-            die(js::locate($this->createLink($from, $method, "productID=$productID"), 'parent'));
+            $url = $this->session->caseList ? $this->session->caseList : $this->createLink('testcase', 'browse', "productID=$productID");
+            die(js::locate($url, 'parent'));
         }
         $this->app->loadLang('testcase');
         $this->testtask->setMenu($this->products, $productID);