rem: callback (current, i++); 
add: callback (current, i++, data); 
context: function lbox_enum (callback){    var i = 0;    var current = this.listContainer.firstChild;        while (current)    {        callback (current, i++);        current = current.nextSibling;    }    }
meta: 8395	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/8395/7d1bdb74c797a650a6fa1487f7c45d23b19b2497/listbox.js/buggy/extensions/irc/xul/lib/listbox.js