Even if you cannot see them, they actually exist.
Celando is a javascript library that with the help of jQuery enables a show more/less system for your elements. It's smart since it knows at what element are you trying to apply the magic so it can works in the correct way through an adapters set. You can even use Celando for lazy loading your stuff via AJAX.
Just a look at the demo should be enough for you, my young padawan.
The prototype of the function is $.celando($target, config): $target can be a single element (i.e. p) or a list of items (i.e. ul > li). config is an optional parameter that allows you to give more informations to Celando about how and what it has to do.
$container: The container in which your elements are stored. If not given, Celando auto-detects it.
$toggleButton: The show more/less button element.
$toggleButtonPos: Where Celando has to put the button when $toggleButton is not defined (if you don't define it, it will append the button to $target).
length: The number of words to show in your paragraph. Default: 300.
numItems: The number of items to show in your list. Default: 3.
animation: Enable or disable the animation. Default: true (aka animations enabled).
animationTime: The duration of the animation. Default: 300 ms.
adapter: Set a your own adapter so Celando can performs strange kind of magics to $target.
onToggle: A function that is invoked when the more/less toggle is performed. The animation function is given as param. It's currently enabled only in LazyList.
callback: A function that is invoked at the end of the setup. The adapter class instance and the config are given as params.
lazy: When enabled, it forces the use of the LazyList adapter. To load your lazy loaded contents, just put your logic in onToggle (and remember, if you want, to perform your animation with the given param). You could use as toggle event even the page scrolling instead than clicking on the link. To do this, just define a listener through callback and call the toggle function through the adapter given as param. Default: false.
label: The toggle button's default text. Default: { more: 'More', less: 'Less' }.