rem: Element.remove(node); 
add: if (null != node) { Element.remove(node); } 
context:     this.remove = function(key) {        // remove this listItem and its corresponding hash entry        // will this work? relying on garbage collection?        var node = this.hash[key];        Element.remove(node);        this.hash[key] = null;        this.lastModified = new Date();    }
meta: 952	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/952/69dedb9c0ffc0c9e18f6293f86204bb722b72414/query.js/buggy/query.js