Popup Of Login Button

Hi, i'm new to yii. I need when i click login button in my application it need display popup window. Here is my main.php... pls help me


<?php

$this->widget('bootstrap.widgets.TbNavbar', array(
'brand'=>'<img src="../images/personalTrainer.png"/>',
'brandUrl' => bu(),
'collapse' => true,
'items'=>array(
array(
'class'=>'bootstrap.widgets.TbMenu',
'items'=>array(
array('label' => 'Home', 'url' => array('/site/index')),
//array('label' => 'Profile', 'url' => array('/user/update', 'id' => app()->user->id), 'visible' => !app()->user->isGuest()),
//array('label' => 'Users', 'url' => array('/user/index'), 'visible' => app()->user->isAdmin()),
array('label'=>'Login', 'url'=>array('/site/login'), 'visible'=>Yii::app()->user->isGuest),
array('label' => 'Register', 'url' => array('/user/create'), 'visible' => app()->user->isGuest),
array('label'=>'('.Yii::app()->user->name.')', 'url'=>array('/site/logout'), 'visible'=>!Yii::app()->user->isGuest,),
array('icon' => 'cog', 'url' => array('/site/logout'), 'visible' =>!Yii::app()->user->isGuest,
'items' => array(
array('label' =>'Settings', 'url'=>array('/site/login'),
'items' => array(
array('label' => 'Goal', 'url' => array('#')),
array('label' => 'Muscles', 'url' => array('#')),
array('label' => 'Schedule', 'url' => array('#')),
array('label' => 'Stats', 'url' => array('#')),
array('label' => 'Equipment', 'url' => array('#')),
array('label' => 'Preferences', 'url' => array('#')),
),
),
array('label' =>'Logout', 'url'=>array('/site/logout')),
),
),

),
),


),
));

?>