open a pop up when click on iframe

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.NET

Hi ,
I want to open a popup when we click on an i frame ,i tried something like

<a id="A6"   runat="server" href='<%# ConfigurationManager.AppSettings["ProductDetailsPage"]+ "rec=" + DataBinder.Eval(Container.DataItem, "p_SUPPLIER_AID").ToString()+"&PageName=" + PageName%>'>
<div id="a1" >
   <iframe id="ifrmCenterTopZone" runat="server" src="HTMLPage1.htm"
                                               marginheight="0" marginwidth="0" height="280px" width="580px" frameborder="0"
                                               scrolling="no"></iframe>
 </div>

but it didn't work.

Any help would be highly appreciated as i am stuck on this since a long time.