frameworkDetect.js

(function () {
  var frameworks = {
    'MooTools Core': 'MooTools.version',
    'MooTools More': 'MooTools.More.version',
    'Base2': 'base2.version',
    'Dojo': 'dojo.version',
    'Ext JS': 'Ext.version',
    'jQuery': 'jQuery.fn.jquery',
    'jQuery UI': 'jQuery.ui.version',
    'MochKit': 'MochiKit.MochiKit.VERSION',
    'PrototypeJS':  'Prototype.Version',
    'Script.aculo.us': 'Scriptaculous.Version',
    'Yahoo UI': 'YAHOO.VERSION',
    'Scripty2': 'S2.Version'
  }, results = [];

  for (var name in frameworks) {
    if (frameworks.hasOwnProperty(name)) {
      var propNames = frameworks[name].split('.'), value = this;

      for (var i = 0; i < propNames.length; i++) {
          value = value && value[propNames[i]];
      }

      if (value) {
        results.push(name + '('+value+')');
      }
    }
  }
  return results;
}());