Passing a Spry XML Dataset to a function

I am very much a noob at this.  How would I pass my XML dataset to a function so that the function would check a "date" field in the XML file and color the corresponding date cell in a YUI calendar?  I have looked through the YUI Forums, but couldn't find any good examples.  I am making a calendar of events that uses a calendar to filter the events in my XML file.  I want the calendar to highlight the dates that have an event scheduled, so the users get a visual pointer to when events are scheduled.  Here is my code:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xmlns:spry="http://ns.adobe.com/spry">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Untitled Document</title>
<script src="SpryAssets/xpath.js" type="text/javascript"></script>
<script src="SpryAssets/SpryData.js" type="text/javascript"></script>
<script src="SpryAssets/SpryDataExtensions.js" type="text/javascript"></script>
<script src="yui/2.6.0/build/yahoo-dom-event/yahoo-dom-event.js" type="text/javascript"></script>
<script src="yui/2.6.0/build/calendar/calendar-min.js" type="text/javascript"></script>
<script src="SpryAssets/SpryDOMUtils.js" language="javascript" type="text/javascript"></script>
<script type="text/javascript">
<!--
var dsMDEvents = new Spry.Data.XMLDataSet("schedule.xml", "events/event", {sortOnLoad: "date", sortOrderOnLoad: "ascending"});
var dsEvents = new Spry.Data.XMLDataSet("schedule.xml", "events/event", {sortOnLoad: "date", sortOrderOnLoad: "ascending"}  );
dsEvents.setColumnType("date", "date");
dsEvents.setColumnType("@id", "number");var thisDate = new Date();
var todaysDate = mydateFormat(thisDate);
function pad(v)
  return (v<10?"0"+v:v);
function mydateFormat(inDate)
  var myData = inDate;
  var gToday = new Date(myData);
  var tToday = pad(gToday.getMonth()+1).toString() + "/" + pad(gToday.getDate()).toString() + "/" + gToday.getFullYear().toString();
  return (tToday);
}//-->
</script>
<link href="yui/2.6.0/build/fonts/fonts-min.css" rel="stylesheet" type="text/css" />
<link href="yui/2.6.0/build/calendar/assets/skins/sam/calendar.css" rel="stylesheet" type="text/css" /><link href="SpryAssets/SpryMasterDetail.css" rel="stylesheet" type="text/css" />
</head><body>
<div id="Schedule">
  <div id="calendarDiv"></div>
  <script type="text/javascript">
// BeginWebWidget YUI_Calendar: yuicalendar1
  YAHOO.namespace("calendar");  (function() {
    var cn = document.body.className.toString();
    if (cn.indexOf('yui-skin-sam') == -1) {
      document.body.className += " yui-skin-sam";
  YAHOO.calendar.init = function() {
YAHOO.calendar.cal1 = new YAHOO.widget.CalendarGroup("cal1", "CalendarDiv", {PAGES:3});    // The following event subscribers demonstrate how to handle
    // YUI Calendar events, specifically when a date cell is
    // selected and when it is unselected.
    // See: http://developer.yahoo.com/yui/calendar/ for more
    // information on the YUI Calendar's configurations and
    // events.
    // The YUI Calendar API cheatsheet can be found at:
    // http://yuiblog.com/assets/pdf/cheatsheets/calendar.pdf
    //--- begin event subscribers ---//
    YAHOO.calendar.cal1.selectEvent.subscribe(selectHandler, YAHOO.calendar.cal1, true);
    YAHOO.calendar.cal1.deselectEvent.subscribe(deselectHandler, YAHOO.calendar.cal1, true);
    //--- end event subscribers ---//
function dateHighlightRenderer(workingDate, cell) {
   var isHighlighted = false;
   var date = workingDate.getMonth()+1 + "/" + workingDate.getDate() + "/" + workingDate.getFullYear();
   /*if (rows["date"].search(date) != -1) {
  isHighlighted = true;
   if (date) {
  isHighlighted = true;
   if (isHighlighted) {
  YAHOO.util.Dom.addClass(cell, this.Style.CSS_CELL_HIGHLIGHT4);
//YAHOO.calendar.cal1.addRenderer("11/14/2009, 11/1/2009, 11/29/2009, 11/30/2009", YAHOO.calendar.cal1.renderCellStyleHighlight1);
for (var i = 1; i <= 7; i++) {
   // Attach to the Weekday, instead of individual dates/ranges, to improve performance.
   YAHOO.calendar.cal1.addWeekdayRenderer(i, dateHighlightRenderer);
YAHOO.calendar.cal1.render();
var todayFilterFunc = function(dsMDEvents, row, rowNumber)
   if (row["date"] >= todaysDate)
   return row; // Return the row to keep it in the data set.
return null; // Return null to remove the row from the data set.
dsMDEvents.filter(todayFilterFunc);
}  function selectHandler(event, data) {
  // The JavaScript function subscribed to yuicalendar1.  It is called when
  // a date cell is selected.
  // alert(event) will show an event type of "Select".
  // alert(data) will show the selected date as [year, month, date]. 
  var formattedDate = pad(data[0][0][1]) + "/" + pad(data[0][0][2]) + "/" + data[0][0][0];
  var dateFilterFunc = function(dsMDEvents, row, rowNumber)
if (row["date"].search(formattedDate) != -1)
   return row; // Return the row to keep it in the data set.
return null; // Return null to remove the row from the data set.
  dsMDEvents.filter(dateFilterFunc); // Filter the rows in the data set.
  };  function deselectHandler(event, data) {
  // The JavaScript function subscribed to yuicalendar1.  It is called when
  // a selected date cell is unselected.
  };      // Create the YUI Calendar when the HTML document is usable.
  YAHOO.util.Event.onDOMReady(YAHOO.calendar.init);
// EndWebWidget YUI_Calendar: yuicalendar1
  </script>
<div class="MasterDetail">
  <div spry:region="dsMDEvents" class="MasterContainer">
    <div class="MasterColumn" spry:repeat="dsMDEvents" spry:setrow="dsMDEvents" spry:hover="MasterColumnHover" spry:select="MasterColumnSelected">{date}<br />
      {name}<br />
      {starttime} - {endtime}</div>
  </div>
  <div spry:detailregion="dsMDEvents" class="DetailContainer">
    <h2 class="DetailColumn">{name}</h2>
    <p class="DetailColumn"><strong>Date:</strong> {date}<br />
    <strong>Time:</strong> {starttime} - {endtime}</p>
    <p class="DetailColumn"><strong>Where:</strong> {location}<br />
    <strong>Type:</strong> {type}</p>
    <p class="DetailColumn"><strong>Contact:</strong> {contact}</p>
  </div>
  <br style="clear:both" />
</div>
</div>
</body>
</html>
and here is a snipet of my xml file:
<?xml version="1.0" encoding="utf-8"?>
<events>
<event id="1">
  <name>Dreamweaver CS4 Intermediate</name>
  <date>10/15/2009</date>
  <starttime>8:00 am</starttime>
  <endtime>5:00 pm</endtime>
  <location>Room 1</location>
  <type>Training</type>
  <contact>Contact 1</contact>
</event>
<event id="2">
  <name>InDesign CS4 Advanced</name>
  <date>11/14/2009</date>
  <starttime>8:00 am</starttime>
  <endtime>5:00 pm</endtime>
  <location>Room 2</location>
  <type>Training</type>
  <contact>Contact 1</contact>
</event>
<event id="3">
  <name>Flex CS4 Data Services</name>
  <date>10/15/2009</date>
  <starttime>1:00 pm</starttime>
  <endtime>5:00 pm</endtime>
  <location>Room 2</location>
  <type>Meeting</type>
  <contact>Contact 2</contact>
</event>
<event id="4">
  <name>Another Dreamweaver CS4 Intermediate</name>
  <date>11/30/2009</date>
  <starttime>8:00 am</starttime>
  <endtime>5:00 pm</endtime>
  <location>Room 1</location>
  <type>Training</type>
  <contact>Contact 1</contact>
</event>
<event id="5">
  <name>Another InDesign CS4 Advanced</name>
  <date>11/29/2009</date>
  <starttime>8:00 am</starttime>
  <endtime>5:00 pm</endtime>
  <location>Room 2</location>
  <type>Training</type>
  <contact>Contact 3</contact>
</event>
<event id="6">
  <name>Another Flex CS4 Data Services</name>
  <date>11/01/2009</date>
  <starttime>1:00 pm</starttime>
  <endtime>5:00 pm</endtime>
  <location>Room 2</location>
  <type>Meeting</type>
  <contact>Contact 2</contact>
</event>
<event id="7">
  <name>More Training</name>
  <date>11/02/2009</date>
  <starttime>8:00 am</starttime>
  <endtime>10:00 am</endtime>
  <location>Room 3</location>
  <type>Training</type>
  <contact>Contact 4</contact>
</event>
<event id="8">
  <name>Another Training</name>
  <date>10/25/2009</date>
  <starttime>9:00 am</starttime>
  <endtime>11:00 am</endtime>
  <location>Room 3</location>
  <type>Training</type>
  <contact>Contact 4</contact>
</event>
<event id="9">
  <name>Some More Training</name>
  <date>12/02/2009</date>
  <starttime>1:00 pm</starttime>
  <endtime>3:00 pm</endtime>
  <location>Room 3</location>
  <type>Training</type>
  <contact>Contact 4</contact>
</event>
</events>
The function "dateHighlightRenderer" is where I am running into the problem.  How do I code this so that "dateHighlightRenderer" can read the "date" field in my XML file?

I have tried the getData() function for this.  However, I am not sure if I am using it right:
var d = dsMDEvents.getData();
for (var i = 0; i < d.length(); i++) {
   var day = d[i]["date"];
   YAHOO.calendar.cal1.addRenderer(day, dateHighlightRenderer);
When I run this for loop, my calendar will not appear on the page.  Any suggestions?

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