var style = that.button.style; style.opacity = '0.1'; 
var style = that.button?that.button.style:null; if (style) { style.opacity = '0.1'; } 
    that.mouseout = function(event) {        var style = that.button.style;        style.opacity = '0.1';    };
4463	/local1/tlutelli/issta_data/temp/all_js/javascript/2007_temp/2007/4463/32d58227bcee00a744838d77c372e9158f343eaf/cacheobj.js/clean/chrome/content/cacheobj.js