How to give a checkbox the value "row number" (like [row selector])

I like to define a checkbox with htmldb_item.checkbox and give the checkbox the value 'row number'.
It has to be the row number as displayed. Therefore I cannot use rownum or row_number() because the htmldb sorting functionality change the sequence after the row numbers are given.
How can I give the checkbox this value, or as alternative how can I get the current row (checkbox element) in javascript from the checkbox onclick event.

Vikas,
Thanks a lot.
This works.
I use this number also to construct javascript and I walk in problems which are also solved now.
therefore for anyone else who also want to use '#ROWNUM#'. keep in mind that for the sql #ROWNUM# is just a string and should be treated as a string therefore use quotes around it. The #ROWNUM# string is translated after executing the query, when the page is constructed from the result of the query.
Fred.

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test@ORA10G>
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3    condition1 varchar2(2),
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5 );
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====================
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BANNER
Oracle Database 10g Enterprise Edition Release 10.2.0.4.0 - 64bi
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