function change_search_type() {
	var search_type = document.getElementById('search_type').value;
	var search_form;
	
	if (document.getElementById('search_form') == undefined)
		search_form = document.getElementById('search');
	else
		search_form = document.getElementById('search_form');
	
	switch(search_type) {
		case '1':
			search_form.action = 'http://google.umn.edu/search';
			document.getElementById('search_site').value = document.getElementById('search_client').value = document.getElementById('search_stylesheet').value = 'tc_onestop';
			break;
		case '2':
			search_form.action = 'http://google.umn.edu/search';
			document.getElementById('search_site').value = 'campus_tc';
			document.getElementById('search_client').value = document.getElementById('search_stylesheet').value = 'searchumn';
			break;
		case '3':
			search_form.action = 'http://www.umn.edu/lookup';
			document.getElementById('search_cn').value = document.getElementById('search_q').value;
			break;
	}	
}