General Support: Changing the port number

I have Plogger installed on an XP maching using apache and mysql. Everything seems to work OK. I created a category, and album, and uploaded an image. When I go to test it, I can see the category, ut when I click it, the port number in the url disappears and it can't locate the next page. If I manually type the port number back in, it works fine.

My question is: How do I keep the port number in the url when clicking on the categories and albums?

I tried to change this
$config["baseurl"] = "http://".$_SERVER["SERVER_NAME"]. substr($_SERVER["PHP_SELF"],0,strrpos($_SERVER["PHP_SELF"],"/")) . "/";

but it didn;t seem to work.
Here is the url. ISP doesn't allow hosting on port 80.

http://thesissons.homedns.org:81/rgsccblog/plogphotos/

Also the thumbnail doesn't work.

I read in a different post "Wrong domain for config..."

change the plog-load_config.php

Change the url part that says this

$config["baseurl"] = "http://".$_SERVER["SERVER_NAME"]. etc...

to this

$config["baseurl"] = "http://".$_SERVER["HTTP_HOST"]. etc...

if you are using a port number in your url..make the change and it should work.