When you look at the permissions on your files using the long listing #ls -l
You will see the format below
-rwxrw--wx
The above is broken down as follows:
the first "-" is a file or it would show as a directory:
drwxrw--wx
The first three after that one are Owner
The second three are Group
The third three are World (or other)

SO, the above permission on this file(directory) would be as follows:
Owner - Read/Write/Execute
Group - Read/Write
World - Write/Execute

So, you need to ensure the final three settings have at least the write enabled...

Cheers, Billster2K