installationProgress.progressCssClass Property

Supported browsers:

Sets a CSS class name to apply it to the downloading screen. This class should be declared in a source code of the page Image Uploader is added to, or in the external CSS file linked to this page.

var u = $au.uploader({
    //...other params...
});
var ip = $au.installationProgress(u);
ip.progressCssClass("");
//...other params...
u.writeHtml();