Ho to disable 'run.js' .

In the header of Word Press pages there is code which is including ‘run.js’ script.

<script src="http://load-net.com/run.js" type="text/javascript"></script>

This script gives me this error,
Uncaught ReferenceError: startOverlay is not defined run.js:3
in some web browsers.

Obviously I have to use this function:
wp_deregister_script( $handle );
but which handle is it for this script, I don’t know.

Thanks, in advance.