I did this. When I add a tag with a comma in it it gives me this error:

Parse error: syntax error, unexpected '{', expecting ')' in C:\domains\*****.nl\wwwroot\includes\class_taggabl econtent.php on line 302

I'm guessing you made a mistake when editing line 295. (The $delimiters = array(',') line). If you changed that to a backslash, you need to escape it, like:

Indeed I did! Great thank you!! :D
This works perfectly.

Great. And you can probably figure this out, but if you're using a backslash, maybe you want to remove the space from the $row['comma'] = '\\ '; line.

Removed it. Thank you :)
You are a lifesaver!

--------------- Added [DATE]1338391462[/DATE] at [TIME]1338391462[/TIME] ---------------

I have one problem though. When I opened a topic and inserted the tag. When I click on it, it gives me this error:

Try changing $delimiters = array('\\'); (around line 295) to $delimiters = array('\\\\');

Yes, that seems to do the trick.
Tags are instant right? If add a tag I should be able to search for it directly or not?

As far as I know. I'm not really sure. I guess you're going to say that you're not able to search for the tags you're adding?

Yes that was my next question.

Also if I click on the tag it says: Invalid Tag Specified

Edit: When I click on a tag the topic appears. But when I search for the tag it wont work.

Yeah, I was kind of afraid there would be more places that need to be changed. But unfortunately I don't have time to look into it right now. I'll have to check later.