There's a few options to get it to display and what you choose depends on how your league site is generated. You could use a server side include (SSI) provided that your host is configured for them. If your league page is php based, you can include it with a php command.
e.g. SSI:
Code:
<!--#include virtual="/<relative_path>/widget.wgt" -->
e.g. PHP:
Code:
include("/<relative_path>/widget.wgt");
Javasript could also be used, but would be a fair amount more complicated.