(function($){
/**
 * provide x-position of an element
 */
$.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;
};

/**
 * provide y-position of an element
 */
$.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;
};
})(jQuery);