add:  if (vocabC.category == null) saveButton.disable(); else saveButton.enable(); 
context: 		    			var comboHandler = function(field,record,index){					    						    	vocabC.categoryUri = record.data.uri;							vocabC.category = record.data.term;				    						    								      						 					    	                            	                };
meta: 2891	/local1/tlutelli/issta_data/temp/all_js/javascript/2007_temp/2007/2891/42c97f6e5b1ee23dbb3279d47e546ee28622f75a/eeAnnotator.js/buggy/gemma-web/src/main/webapp/scripts/ajax/eeAnnotator.js