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			b_count++;
		}
		searchoptions_b+=searchoptions_b_close;
		if(b_count==0){
			searchoptions_b=''
		}
		document.getElementById('topic_b_container').innerHTML=searchoptions_b;
		
		//Hide c
		document.getElementById('topic_c_container').innerHTML='';
		
	}else if(o.name=="topic_b"){
		//Deselect options in c
		if(s_topic_c){ s_topic_c.selectedIndex=0; }
		
		//Build c with subtopics of selected topic a and selected topic b
		var c_count=0;
		var searchoptions_c=searchoptions_c_open;
		for(var topic_c in topic_code[s_topic_a.value][s_topic_b.value]){
			searchoptions_c+='<option value="'+topic_c+'">'+topic_text[topic_c]+"</option>";
			c_count++;
		}
		searchoptions_c+=searchoptions_c_close;
		if(c_count==0){
			searchoptions_c=''
		}
		document.getElementById('topic_c_container').innerHTML=searchoptions_c;
	}
}