rem: var em = this.BBoxFor('<SPAN STYLE="width: 10em; height: 1em"></SPAN>').w/10; if (em != this.em) {this.Init(em)} 
add: var w = this.BBoxFor('x').w; if (w != this.xWidth) {this.Init()} 
context:   ReInit: function () {    var em = this.BBoxFor('<SPAN STYLE="width: 10em; height: 1em"></SPAN>').w/10;    if (em != this.em) {this.Init(em)}  },
meta: 6019	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/6019/39e543f846ebf9878a2a39accded2b2539adb909/jsMath.js/buggy/htdocs/jsMath/jsMath.js