function get_subtopics(topic) {
				var subtopic_div=Array("learn_more", "getting_started", "customer_service", "tech_support", "default");
				var display;
				for (var x=0; x<subtopic_div.length;x++) {
					if (topic.value==subtopic_div[x]) {
						display='';
					} else {
						display='none';
					}
					document.getElementById('subtopic_'+subtopic_div[x]+'_div').style.display=display;
				}
			}