In scripts for example dec1_orb_oracle.m , there are item codes. When u dclick on it etc. it says something. But i cant find the item's id. It doesnt write there. Where can i find item ids that scripts were coded for ?

That information is sadly enough not available. There is no one way for telling the item id.

Your best shot is looking at old UO archive pages/newsgroups and trying to find out how players were supposed to use those items/shrines.