riddler

function getScrollY() 
{
	scrollY = 0;    
	if (typeof window.pageYOffset == "number") {
		scrollY = window.pageYOffset;
	} else if (document.documentElement && document.documentElement.scrollTop) {
		scrollY = document.documentElement.scrollTop;
	}  else if (document.body && document.body.scrollTop) {
		scrollY = document.body.scrollTop; 
	} else if (window.scrollY) {
		scrollY = window.scrollY;
	}
	return scrollY;
}
  
function getInnerHeight() 
{
	height = 0;
	if (window.innerHeight) {
		height = window.innerHeight - 18;
	} else if (document.documentElement && document.documentElement.clientHeight) {
		height = document.documentElement.clientHeight;
	} else if (document.body && document.body.clientHeight) {
		height = document.body.clientHeight;
	}
	return height;
}