24.10.3. A Custom Loading Indicator

It is also possible to override the loading indicator to display an animated icon, or anything else that you want. To do so, override the displayLoadingMessage() and hideLoadingMessage() messages with your own implementations: 
Seam.Remoting.displayLoadingMessage = function() { 
    // Write code here to display the indicator 
}; 
Seam.Remoting.hideLoadingMessage = function() { 
    // Write code here to hide the indicator 
};