Please what are these: 

[londoner]

These strange characters unexpectedly appeared, only with FF and NN, not with IE, on two frames of this site of mine: Londoner, the Marathon random Lottery Number Generator and stopped it computing. When I opened the site with IE, there was nothing wrong. But when I opened it with FF or NN, these strange characters appeared and made the program computing dead. Yesterday I saved these characters on the notepad and checked it. This morning when I opened the file, they were not there.

[[ugly_cat]]

i can't think for that..but,i think(may be wrong) this may be Unicode.

[londoner]

Originally Posted by [ugly_cat]

i can't think for that..but,i think(may be wrong) this may be Unicode.

Thanks for your reply . Problem solved completely.
I repaired the files after I remembered before I had this problem, which developed after I validated my codes on a SEO site. When I told them about it, I got a lengthy reply with the following advice to repair my code:

"What I suggest you do is review how the file is currently
being saved. In your case you do not need UTF-8. It is a
iso-8859-1 document. So one solution would be to do what I
have done. Visit the page with your browser and then use
the "View Source" option in your browser and copy the
HTML. Then open NotePad (a true ASCII text editor) and
paste your HTML there. Then save the document and upload
it to your Web server. Make sure you save it as TEXT and
NOT UTF-8 or any other charset. That should correct your
problem and help you with search engines."

Now Londoner also runs under FF and NN.

Regards

[avril]

 is the UTF Byte Order Mark (BOM). It is often seen as the ASCII characters  right at the very start of a file when viewed in certain apps. Why it is there is quite technical.