function switchSearch(type) {
		
		// define contents
		var link1 = document.getElementById('searchLink1');
		var link2 = document.getElementById('searchLink2');
		var option = document.getElementById('searchType');
		
		// check argument and switch link class
		if(type == 'commercial') {
			link1.className = 'inactive';
			link2.className = 'active2';
		} else {
			link1.className = 'active1';
			link2.className = 'inactive';
		}
		
		// set option input
		option.value = type;
		
	}