Sandboxed solution question

Hi,

I want to deploy a sandboxed solution that will make use of ECMAScript Client Object Model in order to do the required work.

The feature will be scoped site collection and once activated for a specific site collection, the functionality will be for all sites/subsites pages in that site collection.

I will take use of jQuery and some custom .js files therefore I need to add these files to all sites/subsites and pages in that specific site collection where the feature is activated.

In a farm solution this will have been quite easy with a delegate user control on the master page!

Any ideas how can I achieve this so my jQuery and custom .js files will be loaded automatically on all subsites/sites and pages from the specific site collection?

Thanks a lot!