Integrating Selenium Junit tests with silk central efficently

I'm able to run simple Selenium Junit Test case from Silk Central test management tool. Now I want to design selenium framework to work with Silk Central. Please let me know if any one is using silk central to run their selenium scripts designed in junit.

Please find my questions below:

1. How to automatically add the captured screenshot via Selenium web-driver to Run details section of Silk central Junit Test case.

2. How to automatically add my own custom defined log4j file to Run details section of Silk central Junit Test case.

Please help me guys i'm unable to find the answers.

Thank You

Hari