Using Parameters With An Oracle ODBC Connection?

I'm connecting succesfully to an Oracle 10g DB with an the Microsoft ODBC for Oracle driver.Regular queries without parameters work fine, but parameterized queries act as if the parameters aren't getting passed in.ex.

--this works fine

Select * from tbl1 where column1 = 'test'

--this doesn't

select * from tbl1 where column1 = ?
--odbc string parameter 'test'

Here's what my connection string looks like:

"Driver={Microsoft ODBC for Oracle}; " & _
"CONNECTSTRING=(DESCRIPTION=" & _
"(ADDRESS=(PROTOCOL=TCP)" & _

[code]....