I'm not sure if this is simple, or not, but here goes. Some games have solid platforms that you can jump through from underneath. Maple Story comes to mind. There are also various platforms in Mario, and Sonic games like this. I'm wondering if there is a script I can attach to a solid (or whatever, as long as it works) combo to create this effect.

If you are confused to what exactly I'm talking about, I need something that works like the big colored blocks in Super Mario Bros. 3.
http://www.youtube.com/watch?v=Fs299lPuYZo

Thank you.