[TYPO3-english] Problem with text plugin in TYPO3 4.2.1

[harishathreya .]

Hi all,
 I am working on TYPO3 4.2.1, when i click on the page having plain text as
its plugin to edit it it shows me a warning which reads...

*Warning*: fopen(/home/thefull7/public_html/typo3temp/rtehtmlarea/en_iso_8859_1_5ca1a62840f43c5525ee.js)
[function.fopen]: failed to open stream: Permission denied in *
/home/thefull7/public_html/typo3_src/t3lib/class.t3lib_div.php* on line *
2661*
File not written to disk! Write permission error in filesystem?

This error appears in all those instances where text is involved... What is
the actual problem?? i am not able to make out, please help me

Thank you,
Harish.