title: How to set readonly property of a textbox in javascript
body: <p>i have a textbox whose property i need to set as readonly...
  how to set that?
  I tried </p>
  
  <pre><code>document.getElementbyid("txtbox").readonly=true;
  document.getElementbyid("txtbox").disable=true;
  document.getElementbyid("txtbox").setattribute("readonly","readonly");
  </code></pre>
  
  <p>all these are not working for me.
  Disable is working but that is passing the control values as null to the database...again that is a problem for me..</p>