code for showing loading gif while asp:button postback

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ASP.NET

Hi,
I want to show loading gif near to asp:button ,when the page get postback ,
I am not using updatepanel and also dont want to use it.

I have wriiten code as

 <div id="divShowLoadingGif"  runat="server"  style="display:none; ">
        <img id="img2" alt="" src="Ajax_spinner.gif" style="display: inline; height: 16px;" />
       </div>

<asp:Button ID="btnUpload" runat="server" ValidationGroup="u"  OnClick="btnUpload_Click" OnClientClick="showloadingGif_UPLOAD();return true;"  Text="Upload"  />

javascript code

function showloadingGif_UPLOAD() {

     
      document.getElementById('divShowLoadingGif').style.display = 'inline';
      return true;
  }

and the server side code

protected void btnUpload_Click(object sender, EventArgs e)
  {

// my code here

  }

my code is working in IE AND MOZILLA but its not working in google chrome .
In google chrome only clientside code is getting exucuted but server side code is not getting executed.

I have several button where i want to show loading gif near to the asp.net button whenver user click asp.net button

Please help