rem: if (opacity == 0 && this.style.visibility != "hidden") this.style.visibility = "hidden"; else if (this.style.visibility != "visible") this.style.visibility = "visible"; 
add: if (opacity == 0){ if(this.style.visibility != "hidden") this.style.visibility = "hidden"; } else { if(this.style.visibility != "visible") this.style.visibility = "visible"; } 
context: 	setOpacity: function(opacity){		if (opacity == 0 && this.style.visibility != "hidden") this.style.visibility = "hidden";		else if (this.style.visibility != "visible") this.style.visibility = "visible";		if (window.ActiveXObject) this.style.filter = "alpha(opacity=" + opacity*100 + ")";		this.style.opacity = opacity;		return this;	},
meta: 3991	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/3991/e755204dabc7e52dea6f24138793f8d2706a8825/mootools.js/buggy/manager/media/script/mootools/mootools.js