title: ASP.NET AJAX: Firing an UpdatePanel after the page load is complete
body: <p>I'm sure this is easy but I can't figure it out:</p>
  
  <p>I have an ASP.NET page with some UpdatePanels on it.  I want the page to <em>completely</em> load with some 'Please wait' text in the UpdatePanels.  Then once the page is <em>completely loaded</em> I want to call a code-behind function to update the UpdatePanel.</p>
  
  <p>Any ideas as to what combination of Javascript and code-behind I need to implement this idea?</p>
  
  <p>SAL</p>
  
  <p>PS: I've tried putting my function call in the Page_Load but then code is run <em>before</em> the page is delivered and, as the function I want to run takes some time, the page simply takes too long to load up.</p>