Can't be done I'm afraid (or at least not in a web browser, maybe 
Microsoft have changed it in their Windows Scripting Host). The reason 
being, malicious web code could start writing to and reading the files on 
your machine. Similar restrictions for reading, you can't even get a file 
on a web resource sensibly. The only way it is possible is to have frames 
and maybe have an invisible frame and just manipulate the contents that 
way. You cannot save.

> hi guys
> i m in urgent need i need to know how do i write to a file using 
> javascript and read a file 
> 
> thanks in advance