diff --git a/views/bootstrap/class.SchedulerTaskMgr.php b/views/bootstrap/class.SchedulerTaskMgr.php
index 0eb5458d5..8cb227173 100644
--- a/views/bootstrap/class.SchedulerTaskMgr.php
+++ b/views/bootstrap/class.SchedulerTaskMgr.php
@@ -44,6 +44,52 @@ $(document).ready( function() {
 		$('#editaddtask.ajax').trigger('update', {taskid: $(this).data('id'), action: $(this).data('action')});
 	});
 	$('#listtasks.ajax').trigger('update', {});
+
+	$('body').on('click', '.removetask', function(ev){
+		ev.preventDefault();
+		ev.stopPropagation();
+		id = $(ev.currentTarget).attr('rel');
+		confirmmsg = $(ev.currentTarget).attr('confirmmsg');
+		msg = $(ev.currentTarget).attr('msg');
+		formtoken = '<?= createFormKey('removetask') ?>';
+		bootbox.dialog(confirmmsg, [{
+			"label" : "<i class='icon-remove'></i> <?= getMLText("rm_task") ?>",
+			"class" : "btn-danger",
+			"callback": function() {
+				$.post('../op/op.SchedulerTaskMgr.php',
+					{ action: 'removetask', taskid: id, formtoken: formtoken },
+					function(data) {
+						if(data.success) {
+							$('#table-row-task-'+id).hide('slow');
+							noty({
+								text: msg,
+								type: 'success',
+								dismissQueue: true,
+								layout: 'topRight',
+								theme: 'defaultTheme',
+								timeout: 1500,
+							});
+						} else {
+							noty({
+								text: data.message,
+								type: 'error',
+								dismissQueue: true,
+								layout: 'topRight',
+								theme: 'defaultTheme',
+								timeout: 3500,
+							});
+						}
+					},
+					'json'
+				);
+			}
+		}, {
+			"label" : "<?= getMLText("cancel") ?>",
+			"class" : "btn-cancel",
+			"callback": function() {
+			}
+		}]);
+	});
 });
 <?php
 	} /* }}} */
@@ -138,6 +184,11 @@ $(document).ready( function() {
 		$taskid = $this->params['taskid'];
 
 		$task = $scheduler->getTask($taskid);
+		if(!isset($GLOBALS['SEEDDMS_SCHEDULER']['tasks'][$task->getExtension()])) {
+			$this->errorMsg(getMLText('scheduler_extension_not_available'));
+			return;
+		}
+
 		$taskobj = $GLOBALS['SEEDDMS_SCHEDULER']['tasks'][$task->getExtension()][$task->getTask()];
 ?>
 	<form action="../op/op.SchedulerTaskMgr.php" method="post" class="form-horizontal">
@@ -190,7 +241,7 @@ $(document).ready( function() {
 							'id'=>'params_'.$param['name'],
 							'name'=>'params['.$param['name'].']',
 							'value'=>'1',
-							'checked'=>$task->getParameter()[$param['name']] == 1,
+							'checked'=>$task->getParameter($param['name']) == 1,
 						)
 					);
 					break;
@@ -244,7 +295,11 @@ $(document).ready( function() {
 		print "<th></th>\n";	
 		print "</tr></thead><tbody>\n";
 		foreach($tasks  as $task) {
-			echo "<tr".(!$task->getDisabled() ? " class=\"success\"" : "").">";
+			if(!isset($GLOBALS['SEEDDMS_SCHEDULER']['tasks'][$task->getExtension()]))
+				$class = 'error';
+			else
+				$class = 'success';
+			echo "<tr id=\"table-row-task-".$task->getID()."\" class=\"".(!$task->getDisabled() ? " ".$class : "")."\">";
 			echo "<td>";
 			echo $task->getExtension()."::".$task->getTask();
 			echo "</td>";
@@ -263,9 +318,12 @@ $(document).ready( function() {
 			echo "<td>";
 			echo $task->getLastRun();
 			echo "</td>";
-			echo "<td>";
+			echo "<td nowrap>";
 			print "<div class=\"list-action\">";
-			print "<a class=\"edittask\" data-action=\"edittask\" data-id=\"".$task->getID()."\" href=\"../out/out.SchedulerTaskMgr.php?action=edittask\" title=\"".getMLText("edit_task")."\"><i class=\"icon-edit\"></i></a>";
+			print "<a class=\"removetask\" rel=\"".$task->getID()."\" msg=\"".getMLText('remove_task')."\" confirmmsg=\"".htmlspecialchars(getMLText("confirm_rm_task"), ENT_QUOTES)."\" title=\"".getMLText("remove_task")."\"><i class=\"icon-remove\"></i></a>";
+			if(isset($GLOBALS['SEEDDMS_SCHEDULER']['tasks'][$task->getExtension()])) {
+				print "<a class=\"edittask\" data-action=\"edittask\" data-id=\"".$task->getID()."\" href=\"../out/out.SchedulerTaskMgr.php?action=edittask\" title=\"".getMLText("edit_task")."\"><i class=\"icon-edit\"></i></a>";
+			}
 			print "</div>";
 			echo "</td>";
 			echo "</tr>";
@@ -280,6 +338,8 @@ $(document).ready( function() {
 		$taskname = $this->params['taskname'];
 		$scheduler = $this->params['scheduler'];
 	
+		$this->htmlAddHeader('<script type="text/javascript" src="../styles/'.$this->theme.'/bootbox/bootbox.min.js"></script>'."\n", 'js');
+
 		$this->htmlStartPage(getMLText("admin_tools"));
 		$this->globalNavigation();
 		$this->contentStart();
@@ -309,6 +369,7 @@ $(document).ready( function() {
 					echo "</td>";
 					echo "<td>";
 					$params = $task->getAdditionalParams();
+					$k = array();
 					foreach($params as $param)
 						$k[] = $param['name'];
 					echo implode(', ', $k);