context: function QxImagePreloader(vSource){  var m = new QxImagePreloaderManager();  if(m.has(vSource)) {    return m.get(vSource);  };  QxTarget.call(this);  // Create Image-Node  this._element = new Image();  // This is needed for wrapping event to the object  this._element._QxImagePreloader = this;  // Define handler if image events occurs  this._element.onload = QxImagePreloader.__onload;  this._element.onerror = QxImagePreloader.__onerror;  // Set Source  this._source = vSource;  this._element.src = vSource;  // Set PNG State  if ((new QxClient).isMshtml()) {    this._isPng = /\.png$/i.test(this._element.nameProp);  };  m.add(this);};
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