rem: return this._image.style.backgroundImage.indexOf("Unchecked") == -1; 
add: return this._image.style.backgroundImage.indexOf("Checked") != -1; 
context:     isChecked: function() {        return this._image.style.backgroundImage.indexOf("Unchecked") == -1;    },
meta: 5515	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/5515/3a30e99fc76bedab9f0591ce87d68b15b1786fbe/BaseCheckRadio.js/buggy/src/thinwire/render/web/resources/BaseCheckRadio.js