The script adds a button which links to the .hathdl file of a gallery.
it could be useful for Hentai@Home clients/server owner

this is my first script.
I have no knowledge of JS or programming in general therefore expect shit code, but it works.
I mostly build this script from different sources so thanks to:
http://greasemonkey.win-start.de/patterns/match-attribute.html
http://stackoverflow.com/questions/12731801/how-can-i-rewrite-links-with-javascript-or-jquery-and-a-regular-expression
http://help.dottoro.com/ljagksjc.php
http://www.w3schools.com/jsref/jsref_string.asp
http://help.dottoro.com/ljruhkuj.php