ScrollMagic- Animate on Page Load

 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.
  License

Demo | Download