The easiest test you can make is simply click through the lander yourself 20-30 times or so, and watch whether you are redirected where you should be, if it sends you somewhere else ... well, there might be a problem.
It's really a good idea to have some coder screen the LPs you rip and check for code you don't want there, it's certainly a good investment.
This is mootols, which is a Javascript library, similiar as jQuery ( https://en.wikipedia.org/wiki/MooTools ).
Your safest bet is to replace it with clean one from their official website ( https://mootools.net/core )
It would help posting code with pastebin.com since it's easier to have a look at the real stuff.
Try using js beautifier ( lots of them ) to format the code in a readable format.
The eval in the above pic says nothing I'm afraid, since the whole script is needed. The eval will just evaluate ( interpret ) a
piece of string and try to execute it but there are other ways to execute a piece of code without the need for eval.