Chosing highest value from XML file

I’m making a game and it simply counts the score. After you finish you can write your name and score, name and date are saved to XML file like this:

 
<results>
<entry score="14" name="Bob" date="25.1.2006"></entry>
<entry score="10" name="John" date="23.1.2006"></entry>
<entry score="35" name="Anna" date="20.1.2006"></entry>
</results>

What I want now is only to allow input of highest scores. My question is: How to peek highest number from attributes (score) and send it to some text box?

I parse data from XML to Flash with code like this:

 
PopulateLists = function(xml_array){
date_txt.text = name_txt.text = score_txt.text = "";
for (var i=0; i<xml_array.length; i++){
var entry = xml_array*.attributes;
date_txt.text += entry.date + "
";
name_txt.text += entry.name + "
";
score_txt.text += entry.score + "
";
}
}
var players_array;
var results_xml = new XML();
results_xml.ignoreWhite = true;
results_xml.onLoad = function(success){
if (success){
var results = this.firstChild;
players_array = results.childNodes;
PopulateLists(players_array);
}else trace("Error loading XML file.");
}
results_xml.load("results.xml");

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