var feedsFile;
  
  function FeedsFile() {
          var oThis = this;
          var oXmlDom = zXmlDom.createDocument();
          
          this.sections = [];
          this.onload = null;
          
          oXmlDom.load("feeds.xml");
          oXmlDom.onreadystatechange = function () {
                  if (oXmlDom.readyState == 4) {
                          var oSections = oXmlDom.documentElement.getElementsByTagName("section");
  
                          for (var i = 0; i < oSections.length; i++) {
                                  oThis.sections[i] = new FeedsFileElement(oSections[i]);
                          }
                  }
                  
                  if (typeof oThis.onload == "function") {
                          oThis.onload();
                  }
                  oXmlDom = null;
          };
                  
          this.getLinkByFileName = function (sFileName) {
                  for (var i = 0; i < this.sections.length; i++) {
                          var section = this.sections[i];
                          for (var j = 0; j < section.links.length; j++) {
                                  var link = section.links[j];
                                  if (sFileName.toLowerCase() == link.fileName.toLowerCase())
                                          return link;
                          }
                  }
                  alert("Cannot fine the specified feed information.");
                  return this.sections[0].link[0];
          };
  }
  
  function FeedsFileElement(oNode) {
          if (oNode.tagName.toLowerCase() == "section") {
                  this.links = [];
                  var linkNodes = oNode.getElementsByTagName("link");
                  for (var i = 0; i < linkNodes.length; i++) {
                          this.links[i] = new FeedsFileElement(linkNodes[i]);
                  }
          } else {
                  this.fileName = oNode.getAttribute("filename");
          }
          this.name = oNode.getAttribute("name");
  }