title: javascript works on IE but doesnt on firefox and chrome
body: <p>This piece of javascript code works only on IE why and how can i make it work on firefox and chrome.
  Thanks in advance.</p>
  
  <p>Javascript</p>
  
  <pre><code> function uploadFileChange() {
          if (document.getElementById('textbox1').value != document.getElementById("FileUpload1").value) {
              document.getElementById('textbox1').value = document.getElementById("FileUpload1").value;
          }
          return false;
      }
  </code></pre>
  
  <p>HTML/asp.net</p>
  
  <pre><code>&lt;div class="fileinputs"&gt;
      &lt;!-- Upload file invisivel--&gt;
      &lt;asp:FileUpload ID="FileUpload1" ClientIDMode="Static" class="file" runat="server"
          onpropertychange="uploadFileChange();" /&gt;
      &lt;!-- button e textbox falsas para poder dar syles ao button--&gt;
      &lt;div class="fakefile"&gt;
          &lt;asp:TextBox ID="textbox1" CssClass="textbox" ClientIDMode="Static" runat="server"
              Width="31%" ReadOnly="true" /&gt;
          &lt;asp:Button ID="FileChooserButton1" CssClass="btnSubmit" runat="server" Text="Procurar..."
              ForeColor="White" /&gt;
          &lt;asp:Button ID="FileChooserButton2" CssClass="btnSubmit" Text="Apagar" ForeColor="White"
              OnClientClick="clear();" runat="server" /&gt;
      &lt;/div&gt;
  &lt;/div&gt;
  </code></pre>
  
  <p>RESOLVED</p>