title toggle not working

Our webpage was set up so that the text could be hidden and then revealed. The following code was used and suddenly it doesn’t work anymore. Can anyone please help me figure out what code is missing and why it isn’t working now.

The webpage it links to is https://www.wackynation.com/our-events

Thanks for your help.

<h1><img src="wp-content/uploads/2012/03/events-title.gif" alt="Our Events" /></h1>
?
<div class="one_half">
<h2>6th UK Rock Paper Scissors Championships?</h2>
<img src="wp-content/uploads/2012/03/scissors.jpg" alt="" />
Put your decision-making skills to the test at this popular and entertaining knockout tournament.
[toggle title="More details" state="closed"] Now in its sixth year, 250 competitors will battle it out to be crowned the 2012 UK Champion and walk away with a cash prize. Sign up NOW!

<a href="https://www.ukrockpaperscissorschampionships.com/Pages/default.aspx">Launch the UK Rock Paper Scissors Championships website</a>[/toggle]

</div>
<div class="one_half column-last">
<h2>World Baby Crawling Championships?</h2>
<img src="wp-content/uploads/2012/03/baby.jpg" alt="" />
It’s the Olympic year and all attention is on finding the quickest people in the world, including the fastest baby on the planet.
[toggle title="More details" state="closed"]Babies will compete to crawl across a 5 metre mat. The first baby to finish will be crowned the ‘Youngest World Champion’ and will become the 'Fastest baby in the World.' If you would like your brand associated with this new race <a href="https://www.wackynation.com/get-in-touch" title="Get in Touch">get in touch</a>.[/toggle]

</div>
<div class="one_half">
<h2>4th UK Backward Run?</h2>
<img src="wp-content/uploads/2012/03/backwards.jpg" alt="" />
A one mile backward running challenge for both experienced athletes and complete novices.
[toggle title="More details" state="closed"] No other sport could possibly lay claim to be as humorous, as tough, as healthy or as entertaining all at once. There are categories for all levels so why not take part in the daftest race in the UK. Next race is in 2013.

<a href="https://www.reverserunning.com/">Launch the UK Backward Run website</a>[/toggle]

</div>
<div class="one_half column-last">
<h2>World Luck Championships?</h2>
<img src="https://www.wackynation.com/wp-content/uploads/2012/08/event-page-luck-champ1.jpg">
Competitors play a series of games of luck to discover who is the luckiest person in the world.  [toggle title="More details" state="closed"]Discover who is the luckiest person in the world by taking part in a crazy compendium of games and challenges requiring 0% skill and 100% luck. In the end there will be just one! If you would like your brand associated with this new event concept <a href="https://www.wackynation.com/get-in-touch" title="Get in Touch">get in touch</a>[/toggle]
</div>

[Moderator Note: Please post code or markup snippets between backticks or use the code button. Or better still – use the pastebin. As it stands, your code may now have been permanently damaged/corrupted by the forum’s parser.]