title: javascript date object :Error while using addDays function
body: <p>I was trying to execute the below code in my javascript and got some exception</p>
  
  <pre><code> var now3 = new Date();
   now3.addDays(-4);
  </code></pre>
  
  <p>Error throwed is
  Microsoft JScript runtime error: Object doesn't support this property or method</p>
  
  <p>I m using jQuery 1.3.2 in my page .</p>
  
  <p>Whats wrong with this? Please help</p>