index.jsp

      ...
   <p:commandLink onmouseover="showMessageDialog('form50:selectLocationButton', PoliticaDialog.jq);">
              <h:outputText id="selectLocationButton" value="Show MessageDialog"/>
          </p:commandLink>
          <p:dialog modal="true" widgetVar="statusDialog" header="Process..." draggable="false"
                    closable="false">
              <img src="#{request.contextPath}/images/ajaxloadingbar.gif"/>
          </p:dialog>
      ...
      <p:panel id="popup" style="border:0px">
          <p:dialog position="left top" id="MessageDialog" widgetVar="MessageDialog"
                    header="Something to describe the conten">
              <h:outputText value="Content of the Message...."/>
          </p:dialog>
      </p:panel>