(plugin )Multi Column Category List

I have this plugin which lists all categories on a page.

http://pastebin.com/raw.php?i=i867kDUc

the plugin already has an option to exclude certain categories, but since there are a lot of categories, i want to modify it to include certain categories only ( say category 150)

please suggest whatever you think is going to achieve that.

i am not a wordpress programmer, so if possible, please put the entire modified code on pastebin.

Thanks.