add:  if(!this.domNode) return;  
context:   onOpen: function (e){		     this.openEvent = e;		     		     if(e.target.getAttribute('column')) {		       last_column_name = e.target.getAttribute('column');		       last_table_id = e.target.getAttribute('table_id');		     };		     //dojo.debugShallow(e);		     this.open(e.clientX, e.clientY, null, [e.clientX, e.clientY]);		     		     if(e["preventDefault"]){		       e.preventDefault();		     }		   }
meta: 1003	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/1003/bb099333734ab0337772f5b1bccf067ed571abd9/ajax_misc.js/buggy/src/javascript/ajax_misc.js