pdf preview i.e wann see pdf in iframe

hi
masters
I have 1 page i.e   A. aspx . This page 1 query i.e
select decode(filetype,null,'','<a href=""../inc/getfile.aspx?id='||id||'&'|| 'doctype='||lettermaster.filetype||'&'||'file=filetracker.lettermaster-softcopy"" target=_blank>Download</a>&nbsp;|&nbsp;<a href=""../inc/getfile.aspx?id='||id||'& '||'doctype='||lettermaster.filetype||'&'||'file=filetracker.lettermaster-softcopy'|| '&'||'preview=1"" target=pwframe>Preview</a>') as ""_"", diary_no, ' <a href=""frmlettertrack.aspx?office_code='||office_code||'&'||'diaryno=' ||diary_no||'"">'||letter_no||'</a>' as ""Letter No"", sender_date as SDate, sender, subject from lettermaster where vip_catagory " & Trim(cat) & " and is_important='0' and office_Co ...