// Copyright (c) 2005 Thomas Fuchs (http://script.aculo.us, http://mir.aculo.us)//// See scriptaculous.js for full license.var Builder = {  NODEMAP: {    AREA: 'map',    CAPTION: 'table',    COL: 'table',    COLGROUP: 'table',    LEGEND: 'fieldset',    OPTGROUP: 'select',    OPTION: 'select',    PARAM: 'object',    TBODY: 'table',    TD: 'table',    TFOOT: 'table',    TH: 'table',    THEAD: 'table',    TR: 'table'  },  // note: For Firefox < 1.5, OPTION and OPTGROUP tags are currently broken,  //       due to a Firefox bug  node: function(elementName) {    elementName = elementName.toUpperCase();        // try innerHTML approach    var parentTag = this.NODEMAP[elementName] || 'div';    var parentElement = document.createElement(parentTag);    try { // prevent IE "feature": http://dev.rubyonrails.org/ticket/2707      parentElement.innerHTML = "<" + elementName + "></" + elementName + ">";    } catch(e) {}    var element = parentElement.firstChild || null;          // see if browser added wrapping tags    if(element && (element.tagName != elementName))      element = element.getElementsByTagName(elementName)[0];        // fallback to createElement approach    if(!element) element = document.createElement(elementName);        // abort if nothing could be created    if(!element) return;    // attributes (or text)    if(arguments[1])      if(this._isStringOrNumber(arguments[1]) ||        (arguments[1] instanceof Array)) {          this._children(element, arguments[1]);        } else {          var attrs = this._attributes(arguments[1]);          if(attrs.length) {            try { // prevent IE "feature": http://dev.rubyonrails.org/ticket/2707              parentElement.innerHTML = "<" +elementName + " " +                attrs + "></" + elementName + ">";            } catch(e) {}            element = parentElement.firstChild || null;            // workaround firefox 1.0.X bug            if(!element) {              element = document.createElement(elementName);              for(attr in arguments[1])                 element[attr == 'class' ? 'className' : attr] = arguments[1][attr];            }            if(element.tagName != elementName)              element = parentElement.getElementsByTagName(elementName)[0];            }        }     // text, or array of children    if(arguments[2])      this._children(element, arguments[2]);     return element;  },  _text: function(text) {     return document.createTextNode(text);  },  _attributes: function(attributes) {    var attrs = [];    for(attribute in attributes)      attrs.push((attribute=='className' ? 'class' : attribute) +          '="' + attributes[attribute].toString().escapeHTML() + '"');    return attrs.join(" ");  },  _children: function(element, children) {    if(typeof children=='object') { // array can hold nodes and text      children.flatten().each( function(e) {        if(typeof e=='object')          element.appendChild(e)        else          if(Builder._isStringOrNumber(e))            element.appendChild(Builder._text(e));      });    } else      if(Builder._isStringOrNumber(children))          element.appendChild(Builder._text(children));  },  _isStringOrNumber: function(param) {    return(typeof param=='string' || typeof param=='number');  }}