Usage

To use, simple call on the required element i.e.

if($('.contact-form').isOnScreen()) {
  // Display contact form/animate in/change user focus etc...
}

You can pass x & y offsets if you want the check to return true based on a percent/factor amount of the element on screen i.e.

$('.contact-form').isOnScreen(0.2, 0.2)

This would return true if 20% of the element was visible on the x and y axises