Why two columns? DATE datatype contains both date and time. Additionally, you can not store only "time" into a DATE column, as you'd always have date along with time value.
So - use one column and insert date and time together into the column:
SQL> insert into tada (date_and_time)
2 values (to_date('07.08.2006 18:03', 'dd.mm.yyyy hh24:mi'));
1 row created.
If you, however, insist on separating date and time, you'll have to use another datatype (character or number), but such an approach will bring you problems in the future during "date" and "time" manipulation (sorting, date arithmetic, datatype conversions, ...). I'd strongly recommend you NOT to do that.
I used your suggestion but now a problem is how to insert 'second' part of date.
I used following statement but when i looked table there is only date rather the time. or it may be full date and time in column but only date part is visible.
INSERT INTO TADA VALUES ('1536',TO_DATE('09-Jul-2006 00:00','DD-MM-YYYY hh24:mi'),TO_DATE('30-jul-2006 17:40','dd-mm-yyyy hh24:mi'),TO_DATE('11-Jul-2006 18:40','DD-MM-YYYY hh24:mi'),TO_DATE('30-jul-2008 18:35','dd-mm-yyyy hh24:mi'),'Karachi','Enquiry Self',8300,'HR Department',TO_DATE('21-Aug-2006','DD-MM-YYYY'));
Hyperlink in Forms? I have never used them, but - you might research use of the WEB.SHOW_DOCUMENT built-in; there's an example of how to display the URL in the target window. Also, I've read that one could use Java beans (check this OraFAQ Forum thread); it is said that the example is available at Oracle Metalink.