Boris, You thing It is not a code, It is string i want to replace in a table

UPDATE paper SET month = tmonth,  year = tyear, sno = tsno, scode = tscode,; 
lcode = tlcode, code = tcode,subcode = tsubcode, subject = tsubject,;
        name = tname,;
        rdate=trdate, ;
        cat=tcat;
        WHERE sno = thisform.txtsno.value