Extended Entry JS Help

Good morning, folks! I’m running into an issue with same-page extended entries, and I’m hoping one of you can help.

Way back in the day, when I’d first started using EE, I had a lovely JS code that allowed me to extend a blog entry right there on the same page. Being fairly certain that it’s pretty obsolete, I’ve gone in search of a new way to do it, and have found this entry on the forums:

https://ellislab.com/forums/viewthread/56925/

Now, I’ve created a JS (using what you see on that thread) template within my template group of embeds; embedded it into the header of my pages, and added the appropriate extended entry code to my template. Code is below:

The URL where this displays is http://www.thesagefuloak.com/index.php/site/news/site-launch . The problem occurs when I click on the “Read less” link, and I’m smacked upside the head with “The URI you submitted has disallowed characters.” In looking at the URL structure after clicking the “Read less” link, it looks like this:

http://www.thesagefuloak.com/index.php/site/news/[removed]void(0);

And….I’m lost. If you can help me figure this out, I’d really appreciate it. I prefer the idea of not having to navigate to a single entry page to continue reading a post (just personal preference), and would love to once again be able to implement this feature!

Thanks so much, all! 😊