Easy Tooltip 1.0 - jQuery plugin

gistfile1.js

/*
 * Easy Tooltip 1.0 - jQuery plugin
 * written by Alen Grakalic	
 * http://cssglobe.com/post/4380/easy-tooltip--jquery-plugin
 *
 * Copyright (c) 2009 Alen Grakalic (http://cssglobe.com)
 * Dual licensed under the MIT (MIT-LICENSE.txt)
 * and GPL (GPL-LICENSE.txt) licenses.
 *
 * Built for jQuery library
 * http://jquery.com
 *
 */
 
(function($, window, undefined){
	$.fn.easyTooltip = function(options){
		// default configuration properties
		var defaults = {
			xOffset: 10
			, yOffset: 25
			, tooltipId: 'easyTooltip'
			, clickRemove: false
			, content: ''
			, useElement: ''
		}, content
		
		options = $.extend(defaults, options)
		
		return this.each(function(){
			var title = $(this).attr('title')
			
			$(this).hover(function(e){
				content = (options.content != '') ? options.content : title
				content = (options.useElement != '') ? $('#' + options.useElement).html() : content
				$(this).attr('title', '')
				
				if(content != '' && content != undefined){
					$('body').append('<div id="' + options.tooltipId + '">"' + content + '</div>')
					$('#' + options.tooltipId).css({
						position: 'absolute'
						, top: (e.pageY - options.yOffset) + 'px'
						, left: (e.pageX + options.xOffset) + 'px'
						, display: 'none'
					})
					.fadeIn('fast')
				}
			}, function(){	
				$('#' + options.tooltipId).remove()
				$(this).attr('title', title)
			})
			.mousemove(function(e){
				$('#' + options.tooltipId).css({
					top: (e.pageY - options.yOffset) + 'px'
					, left: (e.pageX + options.xOffset) + 'px'
				})
			})
				
			if(options.clickRemove){
				$(this).mousedown(function(e){
					$('#' + options.tooltipId).remove()
					$(this).attr('title', title)
				})
			}
		})
		
	}
})(jQuery, window)

Can I add negative value for the X&Y position?

Hi,
I have implemented this js. but getting duplicate tooltip on the window.

Please suggest some resolution.