function processScroll(){
	var scroll = $("scroll")
	
	var scrollOffset = document.viewport.getScrollOffsets()
	var dim = getPageSize();
	
	if(scrollOffset.top + document.viewport.getHeight() == dim[1]){		
		scroll.setStyle({display: "none"})
		return;
	}
	var wrapper = $$(".wrapper")[0];
	var height = document.viewport.getHeight();
	var newY = scrollOffset.top + height - 151 - 39 - 16;
	if(newY > wrapper.getHeight() - 151 - 195){
		newY = wrapper.getHeight() - 151 - 195;
	}
	
	scroll.setStyle({display: "block", top: newY + "px"})	
}
function getPageSize(){
	
	
	var xScroll, yScroll;
	
	if (window.innerHeight && window.scrollMaxY) {	
		xScroll = document.body.scrollWidth;
		yScroll = window.innerHeight + window.scrollMaxY;
	} else if (document.body.scrollHeight > document.body.offsetHeight){ // all but Explorer Mac
		xScroll = document.body.scrollWidth;
		yScroll = document.body.scrollHeight;
	} else { // Explorer Mac...would also work in Explorer 6 Strict, Mozilla and Safari
		xScroll = document.body.offsetWidth;
		yScroll = document.body.offsetHeight;
	}
	
	var windowWidth, windowHeight;
	if (self.innerHeight) {	// all except Explorer
		windowWidth = self.innerWidth;
		windowHeight = self.innerHeight;
	} else if (document.documentElement && document.documentElement.clientHeight) { // Explorer 6 Strict Mode
		windowWidth = document.documentElement.clientWidth;
		windowHeight = document.documentElement.clientHeight;
	} else if (document.body) { // other Explorers
		windowWidth = document.body.clientWidth;
		windowHeight = document.body.clientHeight;
	}	
	
	// for small pages with total height less then height of the viewport
	if(yScroll < windowHeight){
		pageHeight = windowHeight;
	} else { 
		pageHeight = yScroll;
	}

	// for small pages with total width less then width of the viewport
	if(xScroll < windowWidth){	
		pageWidth = windowWidth;
	} else {
		pageWidth = xScroll;
	}

	arrayPageSize = new Array(pageWidth,pageHeight,windowWidth,windowHeight)
	return arrayPageSize;
}

window.onresize = processScroll
window.onload = processScroll
window.onscroll = processScroll