How To Put Only Changed Fields Into A New Table

Ha all again.
I have this issue:
I have 2 tables:
t1 (id,field1,field2,field3)
and t2 (id,field_name,field_value)

is possible with trigger to insert only changed fields on t1 to t2 like

(changing field1 on t1 with id 21 cause a new row in t2 with fields id=21,field_name="field1", field_value=field1.value)

i hope you understand what i look for.

Is this trigger solution ?

CREATE TRIGGER MAP_CHANGESON t1AFTER INSERT,UPDATEBEGIN
DECLARE @ID SOMEDATA;DECLARE @FIELD1 SOMEDATA;DECLARE @FIELD2 SOMEDATA;DECLARE @FIELD3 SOMEDATA;SET @ID=(SELECT ID FROM INSERTED)SET @FIELD1=(SELECT FIELD1 FROM INSERTED AS T1,DELETED T2 WHERE T1.ID=T2.ID AND T1.FIELD1<>T2.FIELD1)SET @FIELD2=(SELECT FIELD2 FROM INSERTED AS T1,DELETED T2 WHERE T1.ID=T2.ID AND T1.FIELD2<>T2.FIELD2)SET @FIELD3=(SELECT FIELD1 FROM INSERTED AS T1,DELETED T2 WHERE T1.ID=T2.ID AND T1.FIELD3<>T2.FIELD3)IF @FIELD1<>NULL INSERT INTO T2 (ID,FIELD_NAME,FIELD_VALUE) VALUES (@ID,'FIELD1','@FIELD1')IF @FIELD2<>NULL INSERT INTO T2 (ID,FIELD_NAME,FIELD_VALUE) VALUES (@ID,'FIELD2','@FIELD2')IF @FIELD3<>NULL INSERT INTO T2 (ID,FIELD_NAME,FIELD_VALUE) VALUES (@ID,'FIELD1','@FIELD3')RETURNEND