/* ### HELPERS ### */
function $(objId) { return document.getElementById(objId); }

function fPos(obj) {
	var curtop  = 0,
		curleft = 0;
	
	if (obj.offsetParent) {
		do {
			curleft += obj.offsetLeft;
			curtop += obj.offsetTop;
		} while (obj = obj.offsetParent);
	}
	
	return [curleft, curtop];
}