<window border="normal" title="hello" apply="pkg$.TestComposer">

    <script type="text/javascript"  src="test.js"/>

    <textbox id="emails" value="mhj@gmail.com,mhj.hotmail.com"/>   

    <script src="test.js"/>

    <button label="validate">      

  <attribute name="onClick">    

  Clients.evalJavaScript("checkMail(\"" + emails.getValue() + "\")");

      </attribute>

</button>

    <label id="lbl" value="" pre="true"/>

  </window>

</zk>

​