Can not get XML attribute value using javascript and jquery

[merrsaj]

XML:\[code\]<?xml version="1.0" encoding="utf-8"?><Publications LatestPubDate="2012-12-20" Version="0"><PubYear Year="2012"><PubMonth Month="12"><Publication Name="Headline" PubDay="15" ThumbnailWidth="300" ThumbnailHeight="400" ThumbnailPath="FlippingBook/Dev/Frontend/OutPutFolder/Headline/2012/12/15/0/0/A/Content/1/Pg001.jpg" Version="0" Visible="true"/><Publication Name="Headline" PubDay="16" ThumbnailWidth="300" ThumbnailHeight="400" ThumbnailPath="FlippingBook/Dev/Frontend/OutPutFolder/Headline/2012/12/16/0/0/A/Content/1/Pg001.jpg" Version="0" Visible="true"/><Publication Name="Headline" PubDay="17" ThumbnailWidth="300" ThumbnailHeight="400" ThumbnailPath="FlippingBook/Dev/Frontend/OutPutFolder/Headline/2012/12/17/0/0/A/Content/1/Pg001.jpg" Version="0" Visible="true"/><Publication Name="Headline" PubDay="18" ThumbnailWidth="300" ThumbnailHeight="400" ThumbnailPath="FlippingBook/Dev/Frontend/OutPutFolder/Headline/2012/12/18/0/0/A/Content/1/Pg001.jpg" Version="0" Visible="true"/><Publication Name="Headline" PubDay="19" ThumbnailWidth="300" ThumbnailHeight="400" ThumbnailPath="FlippingBook/Dev/Frontend/OutPutFolder/Headline/2012/12/19/0/0/A/Content/1/Pg001.jpg" Version="0" Visible="true"/><Publication Name="Headline" PubDay="20" ThumbnailWidth="300" ThumbnailHeight="400" ThumbnailPath="FlippingBook/Dev/Frontend/OutPutFolder/Headline/2012/12/20/0/0/A/Content/1/Pg001.jpg" Version="0" Visible="true"/></PubMonth></PubYear></Publications>\[/code\]js:\[code\]function get_past_issues(year,month) { $.ajax({ url: './demo/Headline/PublicationList.xml', async: false, success: function(xml) { //$("#dialog").append("<div class = 'issues'>"); $(xml).find("Publications").find($("PubYear[Year='" + year + "']")).each(function() { //alert ($(this).attr ('Year')); $(xml).find("Publications").find($("PubMonth[Month='" + month + "']")).find("Publication").each(function() { alert ($(this).attr ('ThumbnailPath')); }); }); //$("#dialog").append("</div>"); } });\[/code\]For instance I have provided the function year is 2012 and month is 12, however, the fliter $("PubYear[Year='" + year + "']") seems do not work with the find function? How to fix the problem ? thanks