Show Image as Progress Bar on Visualforce Page ActionStatus Tag in Salesforce

Hello Guys..
Mostly we use the the ActionStatus Tag with StartText And StopText Attribute..
Like

<apex:actionStatus startText="Processing..."  id="sts">

We have another way the show the image as progress bar on visualforce page using another tag Apex Facet.

<apex:actionStatus id="sts" style="align:center;">       
            <apex:facet name="start">
                         <apex:image value="/img/loading.gif" title="Processing..."/>
             </apex:facet>
            <apex:facet name="stop"></apex:facet>
</apex:actionStatus>