Paste

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');

}
}