(function($) {
 $.fn.extend({
 dnews: function(options) {
 var settings = $.extend({
 controls: true,
 switchInterval: 4500,
 feedurl: '',
 showdetail: true,
 moretext: '[...]',
 controlsalwaysvisible: true,
 entries: 10
 }, options);
 return this.each(function() {
 var direction = "forward";
 var wrapper = $(this);
 var interval;
 var prevIndex = 0;
 var curIndex = 0;
 var mode = 'auto'; //auto, manual
 var next, prev, play, pause;
 var containerWidth;
 var left;
 var total;
 var allHeadlines;
 var controlbar;
 var previewWraper;
 var mouseEntered = 0;
 function setPlayingStatus(isPlaying) {
 if (isPlaying) {
 play.css('display', 'none');
 pause.css('display', '');
 }
 else {
 play.css('display', '');
 pause.css('display', 'none');
 }
 }
 if (settings.showdetail) {
 previewWraper = $('<div/>').attr('id', wrapper.attr('id') + '-' + 'preview').addClass('preview-wrapper').css('opacity', '0').css('visibility', 'hidden');
 previewWraper.append($('<div/>').addClass('preview')
 .append($('<h4/>'))
 .append($('<p/>'))).append($('<div/>').addClass('tip'));
 wrapper.before(previewWraper);

 }
 if (settings.controls) {
 controlbar = $('<div/>').addClass('control-bar').css('display', 'none');
 wrapper.after(controlbar);
 next = $('<div/>').addClass('next');
 prev = $('<div/>').addClass('prev');
 play = $('<div/>').addClass('play');
 pause = $('<div/>').addClass('pause');
 var left = $('.news', wrapper).width() / 2 - controlbar.width() / 2;
 controlbar.css('left', left);
 controlbar.append($('<div/>').addClass('controls-wrapper').append(prev).append(pause).append(play).append(next));
 setPlayingStatus(true);
 next.click(function() { mode = 'manual'; setPlayingStatus(false); stopAnimation(); direction = "forward"; if (prevIndex > curIndex) { var temp = curIndex; curIndex = prevIndex; prevIndex = temp; } switchNews(); });
 prev.click(function() { mode = 'manual'; setPlayingStatus(false); stopAnimation(); direction = "backward"; if (prevIndex < curIndex) { var temp = curIndex; curIndex = prevIndex; prevIndex = temp; } switchNews(); });
 play.click(function() { mode = 'manual'; setPlayingStatus(true); startAnimation(); });
 pause.click(function() { mode = 'manual'; setPlayingStatus(false); stopAnimation(); });
 }

 var id = 0;
 var descriptions = new Array();
 //build news headlines from feed
 if (settings.feedurl != '') {
 $('.news', wrapper).html('<img src="loading.gif" alt="loading" style="margin-top:6px;margin-left:6px;"/>');
 google.setOnLoadCallback(function OnLoad() {
 var feed = new google.feeds.Feed(settings.feedurl);
 feed.setNumEntries(settings.entries);
 feed.setResultFormat(google.feeds.Feed.XML_FORMAT);
 feed.load(feedLoaded);
 });
 function feedLoaded(result) {
 if (!result.error) {
 $('.news', wrapper).html('');
 var chanels = $(result.xmlDocument).find('channel');
 var newsHome = $('>link', chanels).text();
 var newsDate = chanels.find('lastBuildDate').text();
 var allNews = chanels.find('item');
 allNews.each(function(index, news) {
 id++;
 var headlintext = $(news).find('title').text();
 if (headlintext.length > 100)
 headlintext = headlintext.substr(0, 100) + ' ...';
 var headline = $('<div/>').addClass('headline').append($('<a/>').attr('id', id).html(headlintext).attr('href', $(news).find('link').text()));
 descriptions.push($(news).find('description').text());
 $('.news', wrapper).append(headline);
 });
 setupHeadlines();
 }
 else alert(result.error);
 }
 }
 else {
 $('.news a', wrapper).each(function(index, news) {
 id++;
 descriptions.push($(news).attr('title'));
 $(news).attr('id', id).removeAttr('title');
 });
 setupHeadlines();
 }
 /*wrapper.find('.news').hover(stopAnimation, function() { if (mode == 'auto') startAnimation(); });*/
 function stopAnimation() { clearInterval(interval); }
 function startAnimation() { interval = setInterval(switchNews, settings.switchInterval); }
 function setupHeadlines() {
 if (settings.controls)
 controlbar.css('display', '');
 wrapper.prepend($('<div/>').addClass('news-title'));
 containerWidth = $('.news', wrapper).width() + $('.news-title', wrapper).width();
 allHeadlines = $('.headline', wrapper);
 left = wrapper.find('.news').css('left');
 if (left == 'auto') left = $('.news-title').width() + 'px';
 allHeadlines.css('left', '-' + containerWidth + 'px');
 total = allHeadlines.length;
 $(allHeadlines[curIndex]).css('left', left);
 interval = setInterval(switchNews, settings.switchInterval);
 if (previewWraper != null) {
 var previewWrapperLeft = previewWraper.offset().left;
 previewWraper.animate({ opacity: 0 }, 1000, function() { $(this).css('visibility', 'hidden'); });
 }
 if (!settings.controlsalwaysvisible)
 controlbar.slideUp("fast");
 wrapper.mouseenter(function(e) {
 stopAnimation();
 mouseEntered = getMousePosition(e, wrapper);
 if (!settings.controlsalwaysvisible)
 controlbar.slideDown("fast");
 });

 wrapper.mouseleave(function(e) {
 if (mode == 'auto') startAnimation();
 var mpos = getMousePosition(e, wrapper);
 var direction = mouseEntered[1] > mpos[1] ? "u" : "d";
 if (direction == 'u') {
 if (!settings.controlsalwaysvisible)
 controlbar.slideUp("fast");
 }
 if (direction == 'd') {
 if (previewWraper != null)
 previewWraper.animate({ opacity: 0 }, 500, function() { $(this).css('visibility', 'hidden'); });
 }
 });
 if (settings.controls) {
 controlbar.mouseleave(function() {
 if (!settings.controlsalwaysvisible)
 controlbar.slideUp("fast");
 if (previewWraper != null)
 previewWraper.animate({ opacity: 0 }, 500, function() { $(this).css('visibility', 'hidden'); });
 });
 }
 previewWraper.mouseleave(function() {
 if (!settings.controlsalwaysvisible)
 controlbar.slideUp("fast");
 if (previewWraper != null)
 previewWraper.animate({ opacity: 0 }, 500, function() { $(this).css('visibility', 'hidden'); });
 });
 if (settings.showdetail) {
 $('.headline', wrapper).mouseenter(function(e) {
 var top = -(previewWraper.height() + $('.tip').height() + 2);
 previewWraper.css('top', top);
 var description = descriptions[parseInt($(this).find('a').attr('id')) - 1];
 if (description == '') description = $(this).find('a').html();
 if (description.length > 120) description = description.substr(0, 120);
 description += '<a href="' + $(this).find('a').attr('href') + '">' + settings.moretext + '</a>';
 var previewId = wrapper.attr('id') + '-' + 'preview';
 $('#' + previewId + ' p').html(description);
 $('#' + previewId + ' h4').html($(this).find('a').html());
 var previewleft = $(this).offset().left - previewWrapperLeft;
 previewWraper.css('left', previewleft + 'px')
 .css('visibility', 'visible')
 .stop()
 .animate({ opacity: 1.0 }, 1000, function() {
 });
 });
 }
 }
 function switchNews() {
 if (direction == 'forward') {
 curIndex = (prevIndex + 1) % total;
 $(allHeadlines[prevIndex]).stop().animate({ 'left': containerWidth + 'px' }, "slow", function() {
 $(this).css('left', '-' + containerWidth + 'px');
 });
 $(allHeadlines[curIndex]).stop().animate({ 'left': left }, "slow");
 }
 else {
 curIndex = (prevIndex > 0 ? prevIndex - 1 : total - 1) % total;
 $(allHeadlines[prevIndex]).stop().animate({ 'left': -containerWidth + 'px' }, "slow");
 $(allHeadlines[curIndex]).css({ 'left': containerWidth + 'px' }).stop().animate({ 'left': left }, "slow");
 }
 prevIndex = curIndex;
 }
 function getMousePosition(e, el) {
 var x = 0;
 var y = 0;
 if (e.offsetX || e.offsetY) {
 x = e.offsetX;
 y = e.offsetY;
 }
 else if (e.pageX || e.pageY) {
 x = e.pageX - parseInt($(el).css('left'));
 y = e.pageY - parseInt($(el).css('top'));
 }
 else if (e.clientX || e.clientY) {
 x = e.clientX + document.body.scrollLeft + document.documentElement.scrollLeft;
 y = e.clientY + document.body.scrollTop + document.documentElement.scrollTop;
 }
 return [x, y];
 }

 });
 }
 });
})(jQuery);