add: if(opacity<0.0001) opacity = 0; 
context:   setOpacity: function(opacity) {    if(opacity==1.0) {      this.element.style.opacity = '0.999999';      this.element.style.filter  = null;    } else {      this.element.style.opacity = opacity;      this.element.style.filter  = "alpha(opacity:"+opacity*100+")";    }  }
meta: 4973	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/4973/cd20286092d311391869aa6031bdd86b5e047d0f/effects.js/clean/src/effects.js