Inserting updated column name using trigger

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SQL-Server

trigger

hello experts, i want to be able to insert the name of the column that was modified into another table using after triggers.

USE [Test]
GO
/****** Object:  Trigger [dbo].[trgUpdate]    Script Date: 01/28/2013 13:33:47 ******/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
ALTER trigger [dbo].[trgUpdate] on [dbo].[Tbl_User_Information] 
for update
as
declare @EmpID as int;
declare @Field as varchar(50);
declare @Action as varchar(50);

select @EmpID=i.U_ID from inserted i;
if update(FullName)
	select @Field= (select c.name from syscolumns c join sysobjects o on o.id=c.id where c.name like '%FullName%');
set @Action='Updated';

insert into Test_Table values(@EmpID,@Field,@Action);

...the trigger compiled successfully but after an update on the the Tbl_user_information table for column named fullName....it returned an error saying the subquery returned multiple values. It's probably pointing to the select @Field=(select....) statement. i obtained the subquery from some link i got from google. It's not clear to me.
So how can i just insert the column name into another table (Test_Table) as specified in the code above? Any help will be apreciated.
Thanks in advance.
Minghang