oracle developer 2000 and oracle developer 6

i design a program under:
on server:
network OS windowsNT 4.0 and oracle 8i enterprise
on client:
oracle developer 2000.
i have to change my server to another server working under OS win 2000 and oracle 8i enterprise.
my problem are the NLS_Characterset on the last server which is ‘AR8MSWIN1256’ and my old sere NLS_Characterset is ‘WE8855P1’.
because this problem i can not appear my arabic language in entery data or at preview data.