javascript - parseInt('08') - (or with '09') returns 0

Binary package hint: firefox-3.0

I am displaying two days in two digit using printf of php. Now when this value is passed to javascript, i get 0 in following cirumstances - only for these two nos. I am using firefox 3.0.3

parseInt('08') and parseInt(''09')

I then tested in Error Console of FF and confirmed that i get 0 in these two nos.
My linux is Ubuntu 7.10 and 8.04 on Acer laptop and Dell vostro systems
i tested from 0 till 15.

i amusing PHP 5.2.4-2ubuntu5.3 with Suhosin-Patch 0.9.6.2 (cli) (built: Jul 23 2008 06:44:49) and FireFox 3.0.3

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Tnanks in advance for the solution

ProblemType: Bug
Architecture: i386
Date: Thu Oct 30 15:30:32 2008
DistroRelease: Ubuntu 8.04
Package: firefox-3.0 3.0.3+build1+nobinonly-0ubuntu0.8.04.1
PackageArchitecture: i386
ProcEnviron:
 PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games
 LANG=en_IN.UTF-8
 SHELL=/bin/bash
SourcePackage: firefox-3.0
Uname: Linux 2.6.24-21-server i686