How to bind a column name in PL/SQL

i have this code in a transaction report.
DECLARE
q VARCHAR2 (1000);
t VARCHAR2 (15);
BEGIN
t := '11110000';
q := q || 'select STARTDATE, PHONESOURCE, PHONETO, DURATION ';
q := q || 'from TRANSACTION ';
q := q || 'where TRANS_ID = ' ||t|| 'and STARTDATE between :P3_DATE_FROM and :P3_DATE_TO ';
q := q || 'and PHONESOURCE = :P3_FILTER_BY_TEXT';
RETURN q;
END;
I have a combo box item which suppose to select between 2 different columns (PHONESOURCE & PHONEDEST) lets call this combo box: P3_FILTER_BY.
I need to replace 'PHONESOURCE' (marked) with this combo box in order to set the query dynamically. the question is: is it possible? and if so how?
i tried few variaton of replacing it, but it wouldn't work.

thank u for your answer,
However, i've thought about it and tried it before. but it gave me this error when applying the edit page:
"LS-00103: Encountered the symbol "&" when expecting one of the following..."
even when i checked the "Use Generic Column Names (parse query at runtime only)" check box it gave me this error in runtime.
so, what should i do ??

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>
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>
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http://rapidshare.com/files/402337112/Presentation1.jpg.html
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EMP                  ENAME                ES                   JAMES
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