rem: Element.remove(this.form); 
add: if (this.form.parentNode) Element.remove(this.form); 
context:   removeForm: function() {    if(this.form) {      Element.remove(this.form);      this.form = null;    }  },
meta: 4973	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/4973/ce69ee676a665c2710e7b2f1edf9376c3a2ca806/controls.js/buggy/src/controls.js