Setting up Python script to run from a toolbox?

I use ArcGIS 10.0 and have written some python scripts with input parameters. Now I want to make tools using these scripts. Is it possible to create tools such as in ArcToolBox using python scripts? - I didn't find information on the web how to do it.
What are other possibilities to create tools from scripts using ArcGIS 10.0? It is important that source code would not be accessible for tool user.

Best regards,
Andrzej