Open a new window Onclick of image button

Open a new window Onclick of image button

I am using primefaces 3.5, the latest release for our development work!
Inside the i have which is used to open a new window , based on the URL
constructed with the request paramter.Attached the code for reference.
<p:dataTable>
<p:column style="text-align:center;">
<h:commandLink value="" action="#{claimStatusBean.npfInfo.handleNpf }"
target="_blank" >
<h:graphicImage library="images" name="star_small.png"
rendered="#{claimStatus.npfProvider}"/>
</h:commandLink>
</p:column>
<p:dataTable>
But when i click the action is never invoked.