anchor.diff:  			//--for metastatic diseases button 
   			Element.observe('metastatic-diseases-btn', 'click', function(e){
   				var inField = $('metastaticDiseaseSite');
  -				if(inField.value == '') return;
  +				if(inField.value == '') {
  +                    alert('Select a value first.');
  +                    return
  +                };
   			 	this.addDetails('metastaticDiseaseSite', e.element(), inField.value, 'anchorMetastaticDiseases');
   
   			 	//clear the fields
  
positive.code: 		<tags:hasErrorsMessage path="metastaticDiseaseSite" />
  		<table class="tablecontent" width="80%">
  			<tr>
  				<td width="90%">
  					<ui:autocompleter path="metastaticDiseaseSite" initialDisplayValue="Begin typing here...">
  						<jsp:attribute name="populatorJS">
  							function(autocompleter, text) {
                  				createAE.matchAnatomicSite(text, function(values) {
  
negative.code: 			//--for pre-existing condition button
  		 	Element.observe('pre-cond-btn', 'click', function(e){
  			 	var preCondField = $('preExistingCondition');
  			    if(preCondField.selectedIndex < 1) {
                      alert('Select a value first.');
                      return
                  }
  			    this.addDetails('preExistingCondition', e.element(), preCondField.value, 'anchorPreExistingCondition');
  			    preCondField.selectedIndex = 0;
  			 	
  