$.fn.x = function(n) {
	var result = null;
	this.each(function() {
			var o = this;
			if (n === undefined) {
			var x = 0;
			if (o.offsetParent) {
			while (o.offsetParent) {
			x += o.offsetLeft;
			o = o.offsetParent;
			}
			}
			if (result === null) {
			result = x;
			} else {
			result = Math.min(result, x);
			}
			} else {
			o.style.left = n + 'px';
			}
			});
	return result;
};

$.fn.y = function(n) {
	var result = null;
	this.each(function() {
			var o = this;
			if (n === undefined) {
			var y = 0;
			if (o.offsetParent) {
			while (o.offsetParent) {
			y += o.offsetTop;
			o = o.offsetParent;
			}
			}
			if (result === null) {
			result = y;
			} else {
			result = Math.min(result, y);
			}
			} else {
			o.style.top = n + 'px';
			}
			});
	return result;
};