newbie:sql update

Hi, I'm trying out some few things about updating a database... $connection = odbc_pconnect("OpusDB","","",SQL_CUR_USE_ODBC); // define the rows that are going to be extracted odbc_exec($connection,"UPDATE DeptMaster SET Counter=Counter+1 WHERE DeptDesc='$mydepartment'"); here's the error: Warning: SQL error: [Microsoft][ODBC Microsoft Access Driver] Operation must use an updateable query., SQL state S1000 in SQLExecDirect in c:\inetpub\wwwroot\TMPlvv9ya34u1.php on line 16 I am trying this out on an IIS in XP with the MSACCESS database... Pls. help. Thanks.