Parsing of external XML data

1

Hello,
I have the following XML and I need to extract just two values in the <yweather:condition> tag

code=" "
temp=" "

(current values are code=“34”, temp=“73”, shown in bold below):

<?xml version="1.0" encoding="UTF-8" standalone="yes" ?>
<rss version="2.0" xmlns:yweather="http://xml.weather.yahoo.com/ns/rss/1.0" xmlns:geo="http://www.w3.org/2003/01/geo/wgs84_pos#">
  <channel>
    <title>Yahoo! Weather - Athens, GR</title>
    <link>http://us.rd.yahoo.com/dailynews/rss/weather/Athens__GR/*http://weather.yahoo.com/forecast/GRXX0004_f.html</link>
    <description>Yahoo! Weather for Athens, GR</description>
    <language>en-us</language>
    <lastBuildDate>Sun, 02 May 2010 11:20 am EEST</lastBuildDate>
    <ttl>60</ttl>
    <yweather:location city="Athens" region="" country="Greece" />
    <yweather:units temperature="F" distance="mi" pressure="in" speed="mph" />
    <yweather:wind chill="73" direction="50" speed="7" />
    <yweather:atmosphere humidity="25" visibility="6.21" pressure="30" rising="0" />
    <yweather:astronomy sunrise="6:27 am" sunset="8:15 pm" />
    <image>
      <title>Yahoo Weather</title>
      <width>142</width>
      <height>18</height>
      <link>http://weather.yahoo.com</link>
      <url>http://l.yimg.com/a/i/us/nws/th/main_142b.gif</url>
      </image>
    <item>
      <title>Conditions for Athens, GR at 11:20 am EEST</title>
      <geo:lat>37.98</geo:lat>
      <geo:long>23.74</geo:long>
      <link>http://us.rd.yahoo.com/dailynews/rss/weather/Athens__GR/*http://weather.yahoo.com/forecast/GRXX0004_f.html</link>
      <pubDate>Sun, 02 May 2010 11:20 am EEST</pubDate>
      <yweather:condition text="Fair" **code="34" temp="73"** date="Sun, 02 May 2010 11:20 am EEST" />
      <description>&lt;img src=&quot;http://l.yimg.com/a/i/us/we/52/34.gif&quot;/&gt;&lt;br /&gt; &lt;b&gt;Current Conditions:&lt;/b&gt;&lt;br /&gt; Fair, 73 F&lt;BR /&gt; &lt;BR /&gt;&lt;b&gt;Forecast:&lt;/b&gt;&lt;BR /&gt; Sun - Sunny. High: 78 Low: 59&lt;br /&gt; Mon - Mostly Sunny. High: 78 Low: 60&lt;br /&gt; &lt;br /&gt; &lt;a href=&quot;http://us.rd.yahoo.com/dailynews/rss/weather/Athens__GR/*http://weather.yahoo.com/forecast/GRXX0004_f.html&quot;&gt;Full Forecast at Yahoo! Weather&lt;/a&gt;&lt;BR/&gt;&lt;BR/&gt;
      (provided by &lt;a href=&quot;http://www.weather.com&quot; &gt;The Weather Channel&lt;/a&gt;)&lt;br/&gt;</description>
      <yweather:forecast day="Sun" date="2 May 2010" low="59" high="78" text="Sunny" code="32" />
      <yweather:forecast day="Mon" date="3 May 2010" low="60" high="78" text="Mostly Sunny" code="34" />
      <guid isPermaLink="false">GRXX0004_2010_05_02_11_20_EEST</guid>
    </item>
  </channel>
</rss>

been trying to get to that part and it always gives out “undefined”

trace(weather_xml.firstChild.childNodes[1].childNodes[0].childNodes[12].childNodes[5].childNodes[2].nodeValue);

this breaks down as follows:
weather_xml.firstChild.childNodes[1] // to get to <rss> tag
.childNodes[0] // to get to <channel> tag
.childNodes[12] // to get to <item> tag
.childNodes[5] // to get to <yweather> tag
.childNodes[2] // to get to code=" " attribute
.nodeValue // and show that value

but it doesn’t work at all (all I get is undefined). Does the <?xml version=“1.0” encoding=“UTF-8” standalone=“yes” ?> tag count when I populate nodes or is it commented out? Any ideas what I’m doing wrong?

the XML feed URL is here
http://weather.yahooapis.com/forecastrss?w=946738&u=c