Customize the Loading Image .gif in the Tableau Server

Version 1

    Hi

     

    I'd like  to change the Loading Image which pop up whenever opens a report on tableau server 10 .

    I tried to find the same .gif extension-ed file in tableau server folder like wgserver etc.,  but ended up in failure.

     

    Below is the image like to change.

    Loading.jpg

    Suggestions are most welcome from anyone

     

    Cheers!