It's javascript. Read the source before running it. The obfuscated gook that's 80% of the script has 0 diffs from jQuery as downloaded at jQuery.com; and the rest of the script is easy to verify in 5 minutes.
It's also a great habit to get into. Reading source code is invaluable in understanding and learning. And it is a skill that can be cultivated just like others. For example, the Prey project is an invaluable piece of software, except it's potentially extremely sensitive. Probably worth reading the source first.
You also start to get very well versed in the "usual way of doing things", especially if it's a language/paradigm you're not programming daily in.
It's also a great habit to get into. Reading source code is invaluable in understanding and learning. And it is a skill that can be cultivated just like others. For example, the Prey project is an invaluable piece of software, except it's potentially extremely sensitive. Probably worth reading the source first.
You also start to get very well versed in the "usual way of doing things", especially if it's a language/paradigm you're not programming daily in.