Autocomplete widget 404ing indicator.gif on non-root contexts

[d6y]

Summary: When running on a non-root context, the autocomplete widget references CSS for a background image that will 404 because the context is not included in the img URL.

Expectation: the indicator.gif should be found when using the autocomplete widget in a root or non-root context.

Actual: the browser receives a 404 for this image in a non-root context.

Steps to reproduce: The image comes into play when you type into the text field, and you have to look at the browser console to see the error.

Discussion: https://groups.google.com/forum/#!msg/liftweb/7eNw_pWT2ZE/Ua9yeUKMxJEJ