title: Prevent this page from creating additional dialogs
body: <p>Firefox4 has a new feature  →　【Prevent this page from creating additional dialogs】</p>
  
  <p>But it was also a trouble with me when I hope an alert dialog opened more than once.</p>
  
  <p>Now, A new problem has appeared ...like below ↓</p>
  
  <pre><code>1) I call the alert dialog more than once , and check the  
    【Prevent this page from creating additional dialogs】
  2) I click a download button , My web application is down.... 
  </code></pre>
  
  <p>(my button' event is below....  and because it hasn't into the action , so I'm just  write the client source....)</p>
  
  <p>My Button Event</p>
  
  <pre><code>getDownloadFile:function(){
      $('xform').submit();
  }
  </code></pre>
  
  <p>My Page Code</p>
  
  <pre><code>&lt;div style="display:none;"&gt;
      &lt;form id="xform" action="down.do" method="post" target="xfra"&gt;
      &lt;/form&gt;
  &lt;/div&gt;
  &lt;iframe id="xfra" name="xfra" src="/?scid=dummy.htm" style="width:0px;height:0px;visibility:hidden;"&gt;&lt;/iframe&gt;
  </code></pre>
  
  <p>Hope anybody can help me ...thanks...</p>