add: e = null; 
context: function prepExpandButton(e) {    e.innerHTML   = "";    e.onmousedown = function() { e.onfocus = e.blur };    e.onmouseup   = function() { e.onfocus = window.clientInformation ? null : window.undefined };}
meta: 5054	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/5054/2f17c278371454818c4d50be6f571469262763b9/context_menu.js/buggy/share/web/static/js/context_menu.js