Hi Ambrish,

As far as I know You can't change status images dynamically, but You can use different a4j:status elements for each components/events.

Here's an example how it works:

<a4j:form id="testFrom" ajaxSubmit="true">

  <h:inputText value="">
    <a4j:support event="onblur" status="blurStatus"/>
  </h:inputText>
  <a4j:commandButton value="Submit" status="submitStatus"/>

  <a4j:region>
    <a4j:status id="blurStatus">
      <f:facet name="start">
        <h:graphicImage value="/images/onblur.gif"/>
      </f:facet>
    </a4j:status>
  </a4j:region>

  <a4j:region>
    <a4j:status id="submitStatus">
      <f:facet name="start">
        <h:graphicImage value="/images/submit.gif"/>
      </f:facet>
    </a4j:status>
  </a4j:region>

</a4j:form>

In this case if there is an onblur event on the h:inputText tag the onblur.gif will appear, but if You click on submit button the submit.gif will do.

Regards,
Tamas