ScrollMagic - The jQuery plugin for magical scroll interactions

ScrollMagic is a jQuery plugin which essentially lets you use the scrollbar like a playback scrub control.

It's the plugin for you, if you want to: 

• start an animation at a specific scroll position.
• synchronize an animation to the scrollbar movement.
• pin an element at a specific scroll position (sticky elements).
• pin an element for a limited amount of scroll progress (sticky elements).
• easily add a parallax effect to your website.
• create an inifinitely scrolling page (ajax load of additional content).
• call functions when the user hits certain scroll positions or react in any other way to the current scroll position.

The major perks of using ScrollMagic include:

• optimized performance
• flexibility
• mobile compatibility
• ready for responsive webdesign
• object oriented programming and object chaining
• event management
• support for both scroll directions (even different on one page)
• support for scrolling inside div containers (even multiple on one page)
• extensive debugging and logging capabilities