add:   this.frame.src = "about:blank"; 
context:     _setLocation: function(location) {        if (browserVersion.isSafari) {            this.frame.src = location;        } else {            this.frame.contentWindow.location.replace(location);        }    },
meta: 4983	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/4983/bdf50299ec90235355e5c177afdd0f378929ba91/selenium-testrunner.js/buggy/code/javascript/core/scripts/selenium-testrunner.js