rem: getMarkupDocumentViewer().textZoom = aZoom / 100; 
add: this.markupDocumentViewer.textZoom = aZoom / 100; 
context:   set textZoom(aZoom) {    if (aZoom < this.MIN || aZoom > this.MAX)      throw Components.results.NS_ERROR_INVALID_ARG;    getMarkupDocumentViewer().textZoom = aZoom / 100;  },
meta: 8395	/local1/tlutelli/issta_data/temp/all_js/javascript/2007_temp/2007/8395/11dc4a0e47c43cafb7237bb2ae057410b83c4011/viewZoomOverlay.js/clean/toolkit/content/viewZoomOverlay.js