Lightwindow uses the Scriptaculous Javascript library, which reserves the ‘$’ as a shortcut. The jQuery.noConflict function is then required, to change jQuery’s shortcut from the ‘$’ to just ‘jQuery’. This way, each library knows which pieces of code to look at. (I believe this is the case with most javascript libraries.)

Often times, I do something like this: var jq = jQuery.noConflict();
so that my functions look like this: jq(‘#test’).click(function(){});