How to download complete mangas from
http://www.onemanga.com/. This guide is updated since links and pictures were gone.
Complete step by step guide for the beginner.
1.
Create a new project in picaloader with the following settings.
Folder Structure: Create a subfolder for each task
Picture Filename: Customize file name "PATH+FNAME+EXT"

This step enables the manga to be downloaded into separate folders for each chapter. Vital and handy.
2.
Make sure the Drop Box is enabled by going to The Menu View and checking drop box

3.
Go to
http://www.onemanga.com/directory/ and navigate to the manga you want to download. In my case I'll choose Backstage Prince. Then drag the link of the manga you want into Picaloader's Dropbox.

4.
Click Ok on the popup window and the manga you selected will be added as a task.

5.
Now select your task in the task viewer and the navigate to the option tab. You will see a similar screen.

6.
Next we will add a few filters. This is done the same way for whichever manga you choose. For the page URL filter it will be the name of your manga in slashes such as /Backstage_Prince/ for me. You can pull this name off the end of the starting URL.

7.
The other filter needed in the picture URL include filter. This is found by navigating to any picture in the manga, right clicking it in firefox, and selecting view image. (Sorry IE users)

8.
When viewing the image look at the url. It will look similiar to the picture, but have different numbers for different mangas. We want the highlighted text after mangas as our picture url include filter. This is because it is the number of the manga, so you will only get pictures from that manga.

9.
Now make sure your task is enable and run the project. Your manga(s) will be downloaded into folders that are separated by chapter. They are generally in order of first to last although it might not be "1, 2, 3," it may be "441, 442, 443", but it's the same thing. (Folder structure looks similar to image)

10.
Enjoy reading your manga offline. *Note downloading many at once can take a while, be patient.* Feel free to comment.

11.
I've attached my project file as a further example if anyone needs it.