La librería DOMhelp

Esto es una librería que me he compuesto sacando diversas funciones de un libro, y que principalmente contiene funciones para el manejo de la estructura DOM de un documento (encontrar nodos, cambiarles el texto, etc)

var DOMhelp =
{
  // Find the last sibling of the current node
  lastSibling:
  function(node) {
    var tempObj=node.parentNode.lastChild;
    while (tempObj.nodeType!=1 && tempObj.previousSibling!=null)
      tempObj=tempObj.previousSibling;
    return (tempObj.nodeType==1)?tempObj:false;
  },

  // Find the first sibling of the current node
  firstSibling:
  function(node) {
    var tempObj=node.parentNode.firstChild;
    while (tempObj.nodeType!=1 && tempObj.nextSibling!=null)
      tempObj=tempObj.nextSibling;
    return (tempObj.nodeType==1)?tempObj:false;
  },

  // Retrieve the content of the first text node sibling of the current node
  getText:
  function(node) {
    if(!node.hasChildNodes()) {return false;}
    var reg=/^s+$/;
    var tempObj=node.firstChild;
    while (tempObj.nodeType!=3 && tempObj.nextSibling!=null || reg.test(tempObj.nodeValue))
      tempObj=tempObj.nextSibling;
    return tempObj.nodeType==3?tempObj.nodeValue:false;
  },

  // Set the content of the first text node sibling of the current node
  setText:
  function(node,txt) {
    if(!node.hasChildNodes()) {return false;}
    var reg=/^s+$/;
    var tempObj=node.firstChild;
    while (tempObj.nodeType!=3 && tempObj.nextSibling!=null || reg.test(tempObj.nodeValue))
      tempObj=tempObj.nextSibling;
    if (tempObj.nodeType==3)
      tempObj.nodeValue=txt;
    else
      return false;
  },

  // Find the next or previous sibling that is an element and not a text node or line break
  closestSibling:
  function(node,direction) {
    var tempObj;
    if(direction==-1 && node.previousSibling!=null) {
      tempObj=node.previousSibling;
      while (tempObj.nodeType!=1 && tempObj.previousSibling!=null)
        tempObj=tempObj.previousSibling;
    }
    else if(direction==1 && node.nextSibling!=null) {
      tempObj=node.nextSibling;
      while (tempObj.nodeType!=1 && tempObj.nextSibling!=null)
        tempObj=tempObj.nextSibling;
    }

    return tempObj.nodeType==1?tempObj:false;
  },

  // Create a new link containing the given text
  createLink:
  function(to,txt) {
    var tempObj=document.createElement('a');
    tempObj.appendChild(document.createTextNode(txt));
    tempObj.setAttribute('href',to);
    return tempObj;
  },

  // Create a new element containing the given text
  createTextElm:
  function(elm,txt) {
    var tempObj=document.createElement(elm);
    tempObj.appendChild(document.createTextNode(txt));
    return tempObj;
  },

  // Cancels a click
  cancelClick:
  function(e) {
    if (window.event && window.event.cancelBubble && window.event.returnValue) {
      window.event.cancelBubble = true;
      window.event.returnValue = false;
      return;
    }
    if (e && e.stopPropagation && e.preventDefault) {
      e.stopPropagation();
      e.preventDefault();
    }
  },

  // Cross-browser event handling for IE5+, NS6+ and Mozilla/Gecko
  // By Scott Andrew
  addEvent:
  function(elm, evType, fn, useCapture) {
    if (elm.addEventListener) {
      elm.addEventListener(evType, fn, useCapture);
      return true;
    }
    else if (elm.attachEvent) {
      var r = elm.attachEvent('on' + evType, fn);
      return r;
    }
    else
      elm['on'+window.event.srcElement:e?e.target:null;
    if (!target) {return false;}
    return target;
  },

  // Stops the bubbling propagation of the event
  stopBubble:
    function(e) {
    if(window.event && window.event.cancelBubble) {
      window.event.cancelBubble = true;
    }
    if (e && e.stopPropagation) {
      e.stopPropagation();
    }
  },

  // Prevents for default actions (cross-browser except for Safari)
  stopDefault:
  function(e) {
    if(window.event && window.event.returnValue) {
      window.event.cancelBubble = true;
    }
    if (e && e.preventDefault) {
      e.preventDefault();
    }
  },

  // Simulate a debugging console to avoid the need for alerts
  initDebug:
  function() {
    if(DOMhelp.debug) {DOMhelp.stopDebug();}
    DOMhelp.debug=document.createElement('div');
    DOMhelp.debug.setAttribute('id',DOMhelp.debugWindowId);

    if (document.documentElement)
      document.getElementsByTagName('body')[0].insertBefore(DOMhelp.debug,document.getElementsByTagName('body')[0].firstChild);
    else if (document.body)
      document.body.insertBefore(DOMhelp.debug,document.body.firstChild);
    //else
    //[Netscape stuff]
  },

  setDebug:
  function(bug) {
    if(!DOMhelp.debug) {DOMhelp.initDebug();}
    DOMhelp.debug.innerHTML+=bug+'n';
  },

  stopDebug:
  function() {
    if(DOMhelp.debug) {
      DOMhelp.debug.parentNode.removeChild(DOMhelp.debug);
      DOMhelp.debug=null;
    }
  }
}