<xsl:template match="entity">
  <div onclick="window.event.cancelBubble = true;clickOnEntity(this);" onselectstart="return false" ondragstart="return false">
  <xsl:attribute name="image"><xsl:value-of select="image"/></xsl:attribute>
  <xsl:attribute name="imageOpen"><xsl:value-of select="imageOpen"/></xsl:attribute>
  <xsl:attribute name="open">false</xsl:attribute>
  <xsl:attribute name="id">f<xsl:value-of select="@id"/></xsl:attribute>
  <xsl:attribute name="open">false</xsl:attribute>
  <xsl:attribute name="STYLE">
    padding-left: 20px;
    cursor: hand;
    <xsl:if expr="depth(this) > 2">
      display: none;
    </xsl:if>
  </xsl:attribute>
    <table border="0" cellspacing="0" cellpadding="0">
      <tr>
        <td valign="middle">
          <img border="0" id="image">
            <xsl:attribute name="SRC">
              <xsl:value-of select="image"/>
            </xsl:attribute>
          </img>
        </td>
        <td valign="middle" nowrap="true">
        <xsl:attribute name="STYLE">
          padding-left: 7px;
          font-family: Verdana;
          font-size: 11px;
          font-color: black;
        </xsl:attribute>
        <xsl:value-of select="description"/></td>
      </tr>
    </table>
  <xsl:apply-templates select="contents/entity"/>
  </div>
</xsl:template>

</xsl:stylesheet>
tree.js的内容：
function initialize() {
  var xmlDoc
  var xslDoc

  xmlDoc = new ActiveXObject(''''Microsoft.XMLDOM'''')
  xmlDoc.async = false;

  xslDoc = new ActiveXObject(''''Microsoft.XMLDOM'''')
  xslDoc.async = false;

  xmlDoc.load("tree/tree.xml")
  xslDoc.load("tree/tree.xsl")

  folderTree.innerHTML = xmlDoc.documentElement.transformNode(xslDoc)
}

function clickOnEntity(entity) {
  if(entity.open == "false") {
    expand(entity, true)
  }
  else {
    collapse(entity)
  }
  window.event.cancelBubble = true
}

function expand(entity) {
  var oImage

  oImage = entity.childNodes(0).all["image"]
  oImage.src = entity.imageOpen
  for(i=0; i < entity.childNodes.length; i++) {
    if(entity.childNodes(i).tagName == "DIV") {
      entity.childNodes(i).style.display = "block"
    }
  }
  entity.open = "true"
}

function collapse(entity) {
  var oImage
  var i

  oImage = entity.childNodes(0).all["image"]
  oImage.src = entity.image

  // 收缩和隐藏字节点
  for(i=0; i < entity.childNodes.length; i++) {
      if(entity.childNodes(i).tagName == "DIV") {
        if(entity.id != "folderTree") entity.childNodes(i).style.display = "none"
        collapse(entity.childNodes(i))
      }
    }
  entity.open = "false"
}

function expandAll(entity) {
  var oImage
  var i

  expand(entity, false)

  // 展开子节点
  for(i=0; i < entity.childNodes.length; i++) {
    if(entity.childNodes(i).tagName == "DIV") {
      expandAll(entity.childNodes(i))
    }
  }
}      

麻烦大家了，江湖救急呀，我等着用这个来显示一棵很大很大的树呢。