Updating the table

Hi i am updating one table which is having 2 fk and one more field value while inserting i dont have any issues but while updating i dont want to update those 2fk values want to change only the other field value how can i do it (if i am changing all the values it is getting changed even update but i want those 2 values as same and want to change only one value in my table)

ex

table 1 

id,

fk1,

fk2,

value

i just dont want to change the 2 fk values while i am updating how can i do some one there to help

---

harika

harika