How set a 'loading image' with a small sleeo on image upload ajaxLink

Yii 1.1 General Discussion
1

How set a ‘loading image’ with a small sleep on image upload ajaxLink

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echo CHtml::ajaxLink('View all '.$count.'comments', Yii::app()->createUrl('ActivityActions/allcomments' ),

array('type' =>'GET',

'data' => array( 'val1' =>$list_1->id ),

'dataType' => 'text','update' => "#req_res".$list_1->id),

array('class'=>'ajaxlink')

);