rem: this.markupDocumentViewer.textZoom = aZoom / 100; 
add: return (getBrowser().markupDocumentViewer.fullZoom = aVal); 
context:   set textZoom(aZoom) {    if (aZoom < this.MIN || aZoom > this.MAX)      throw Components.results.NS_ERROR_INVALID_ARG;    this.markupDocumentViewer.textZoom = aZoom / 100;  },
meta: 10520	/local1/tlutelli/issta_data/temp/all_js/javascript/2007_temp/2007/10520/7f4da1f97849a21530b0ad95c48a99435a44449f/viewZoomOverlay.js/clean/toolkit/content/viewZoomOverlay.js