Please help me with advanced guestbook 2.2!

I'd like to remove some of the images, and place them with my own (like for example the green "Advanced guestbook powered by PHP and MySQL" image, and the "Sign my guestbook" image. (They are both on top of the page).

When I try to go to "Templates" and replace the photos with others, I only get these error messages:

Warning: fopen("./templates/body.php", "w") - Permission denied in xxx on line 180

Warning: fwrite(): supplied argument is not a valid File-Handle resource in xxx on line 181

Warning: fclose(): supplied argument is not a valid File-Handle resource in xxx on line 187

(The "xxx" es are the some kind of urls ending with admin.class.php)

What am I doing wrong..?

why don't you read the error message and see what it is telling you. The message is there for a reason, so as to point you towards what is wrong.

In this case it is telling you that permissions are denied. Reason for this, is that you failed to CHMOD (Change Mode) the templates permissions to 666 making it globaly writeable. set all your template files to 666.

don't ask me how to CHMOD it. You should already know how to do this.

why should he/she allready know this, look if your giving help to someone help them, dont berate them for not knowing something that you "think" they should know.