function getCheckedIndex(radio) {
	for( var i = 0; i < radio.length; i++ ) {
		if ( radio[i].checked ) {
			return i;
		}
	}
	return null;
}
     
function isNumber(keyword) {
	return keyword.search(/\D/i) == -1;
}
     
function runSearch() {
	var searchForm = document.forms.search;
	var checkedIndex = getCheckedIndex( searchForm.m );
	
	if ( checkedIndex == null ) {
		alert('검색 방법을 선택해 주십시오.');
		return;
	}
	
	var keyword = searchForm.keyword.value.replace(/^\s+|\s+$/g,'');
	
	if ( keyword.length == 0 ) {
		alert('검색어를 입력해 주십시오');
		return;
	}

	searchForm.submit();
}