The problem is that it’s not exactly common for all themes. Depending on what variables your theme creator used, the code changes slightly. Here’s something from my theme: http://snipt.org/wqi8
And so all those “PST-posts-box” etc. are whatever the theme creator decided to call for his/her theme. And, additionally, if those aren’t defined, then either they have to be defined or have to change code slightly more than the basic structure I copied in that link above (which is of course, from the person who’s theme I’m using).
BASICALLY… it’s not just a copy-paste of a code. :(