[orjan]

I counted your named columns and got those to 23, but then your values, I were counting to 24, so there are one value too much there...
and, you shall not have parenthesis around each value, as John mentions above.

and as you're entering all columns if i'm right, you don't have to specify them at all

table with three columns can be inserted like this:

insert into mytable values (1,2,3);

if you want to enter more than one row at a time, you can write

insert into mytable values (1,2,3), (4,5,6), (7,8,9);

for inserting three rows at once.

btw, your code seems a bit unsecure as you drop your $_POST values directly into the database, as there is easily sql injections possible there.
I know that someone here (John?) made an excellent tutorial on sql injections.