scrolltop all browsers

scrolltopall.js

// scrolltop all browsers
function getScrollTop(){
	if(typeof pageYOffset!= 'undefined'){
		//most browsers except IE before #9
		return pageYOffset;
	}
	else{
		var b = document.body; //IE 'quirks'
		var d = document.documentElement; //IE with doctype
		d = (d.clientHeight)? d: b;
		return d.scrollTop;
	}
}