ASP.NET: Combres calls '$ is undefined' when jQuery is compressed

Question

For those who have some know-how using Combres, this is for you:

My Combres.xml looks like this:

<?xml version="1.0" encoding="utf-8" ?>
<combres xmlns='urn:combres'>

  <filters>
    <filter type="Combres.Filters.FixUrlsInCssFilter, Combres" />
  </filters >
  <cssMinifiers>
    <minifier name="yui" type="Combres.Minifiers.YuiCssMinifier, Combres">
      <param name="CssCompressionType" type="string" value="StockYuiCompressor" />
      <param name="ColumnWidth" type="int" value="-1" />
    </minifier>
  </cssMinifiers>
  <jsMinifiers>
    <minifier name="yui" type="Combres.Minifiers.YuiJSMinifier, Combres">
      <param name="IsVerboseLogging" type="bool" value="false" />
      <param name="IsObfuscateJavascript" type="bool" value="true" />
      <param name="PreserveAllSemicolons" type="bool" value="false" />
      <param name="DisableOptimizations" type="bool" value="true" />
      <param name="LineBreakPosition" type="int" value="-1" />
    </minifier>
  </jsMinifiers>
  <resourceSets url="~/combres.axd" defaultDuration="30"
                                defaultVersion="auto"
                                defaultDebugEnabled="false"
                                defaultCssMinifierRef="off" 
                                defaultJSMinifierRef="off"> 
    <resourceSet name="siteCss" type="css" minifierRef="yui">
      <resource path="~/css/jquery-ui-1.7.2.custom.css"  />
      <resource path="~/css/OMNIv2.css" />
      <resource path="~/css/dataTable.css" />
    </resourceSet>
    <resourceSet name="siteJs" type="js" >
      <resource path="~/js/jquery-1.4.2.min.js" minifierRef="off" />
      <resource path="~/js/jquery.jstree.min.js" minifierRef="off" />
      <resource path="~/js/jquery.dataTables.min.js" minifierRef="off" />
      <resource path="~/js/jquery.cookie.min.js" minifierRef="off" />
      <resource path="~/js/jquery-ui-1.7.2.custom.min.js" minifierRef="off" />
      <resource path="~/js/jquery.collapsible-v.2.1.3.js" minifierRef="yui" />
      <resource path="~/js/jquery.fileupload.js" minifierRef="yui" />
      <resource path="~/js/original/OMNIv2.js" minifierRef="yui" />
    </resourceSet>
  </resourceSets>
</combres>

DefaultDebugEnabled is set to false, that is, the module will now start working ... built-in Javascript and one of my ClientRegisterScriptBlocks explodes, saying that '$ is undefined'. Obviously jQuery was not loaded or crippled in some way. If I actually run this with the defaultDebugEnabled parameter set to true, the combined JS works fine and all the links work. Are there any ideas as to why this is happening? The magazine shows nothing unusual.

Conclusion:

//These are from the master page
<link rel="stylesheet" type="text/css" href="/combres.axd/siteCss/1/"/>
<script type="text/javascript" src="/combres.axd/siteJs/a/"></script>

// This is in my Default.aspx 
<script type="text/javascript" >
   function pageLoad() {
    var $NavSlider = $("#NavSlider"); // THIS DOESN'T WORK, $ is undefined
   }
</script>

Answer 1

, Combres . JQuery , - . . Combres IMO.

Answer 2

Combres , , . , , javascript .