title: disabled works in IE but not in firefox
body: <p>this is my javascript code. on load function i have to disable btndelete ..it works correct in iE but in firefox, buton is not dsabled..i dont know is this a css issue or what?</p>
  
  <p><strong>Javascript</strong></p>
  
  <pre><code> window.onload = body_Onload;
  
              function body_Onload()
              {
                      var btnDelete = document.getElementById('&lt;%=btnDelete.ClientID%&gt;');
                  btnDelete.disabled = true;
              }
  </code></pre>
  
  <p><strong>HTML</strong></p>
  
  <pre><code>&lt;asp:Button ID="btnDelete" runat="server" CssClass="cssbutton" Text="Delete" Width="60px" OnClick="btnDelete_Click" /&gt;
  </code></pre>
  
  <p><strong>CSS</strong></p>
  
  <pre><code>.cssbutton
  {
      font-weight: bold;  
      border-right: #3C8FD1 1px solid;
      border-top: #3C8FD1 1px solid;
      border-left: #3C8FD1 1px solid;
      border-bottom: #3C8FD1 1px solid;
      font-size: 10px;
      color: #045FA7;
      font-family: Verdana, Geneva, Arial, Helvetica, sans-serif;
      background-image: url(../App_Images/cssbuttonbg.gif);
      line-height: 14px;
  }
  </code></pre>
  
  <p><strong>HTML Generated Code</strong></p>
  
  <pre><code>&lt;input type="submit" name="pageMain$contentPlaceHolderMain$btnDelete" 
      value="Delete" onclick="return btnDelete_Click();"
      id="contentPlaceHolderMain_btnDelete" class="cssbutton" style="width:60px;"/&gt;
  </code></pre>