void main()
{
object oPC = GetEnteringObject();
object oBookshelf = GetNearestObjectByTag("Bookshelf",OBJECT_SELF);

int iPCSearch = GetLocalInt(oBookshelf,"PCSearch");

if (GetIsPC(oPC) && !GetIsDM(oPC) && (iPCSearch==0))
    {
    ActionStartConversation(oPC,"librarysearch",TRUE,FALSE);
    }
}