function login(form,admin){
	if($.trim($(form+' input[type=text]').val())==''){
		alert('用户名不能为空');
		$(form+' input[type=text]').focus();
		return false;
	}
	if($.trim($(form+' input[type=password]').val())==''){
		alert('密码不能为空');
		$(form+' input[type=password]').focus();
		return false;
	}
	admin = admin==1 ? '':'admin/';
	var option = {
		'url':$(form).attr('action'),
		'data':$(form).serialize(),
		'type':'post',
		'success':function(data){
			if(data=='success')
				document.location.href = admin+'index.php';
			else
				alert(data);
		}
	}
	$.ajax(option);
	return false;
}