problems with special characters

[Aldo Bombelli]

hi!

i'm tryiing to insert german text through a database connection.
ther are som special characters like "ü,ö" how are not rendered
correct. i wrote a script; this php- script rewrite all special
characters in the numerich ascii format (ä = ä)
this works fine, but there are some characters, specialy "ö"
and "ü" how arent rendered.

can someone help?
thanks
aldo