jQuery cacher

gistfile1.js

//Return a cached selection if it's been used,
//Otherwise get the jQuery selection and cache it
var $$ = function(x) {
    if (!this[x]) this[x] = $(x);
    return this[x];
};

//Use $ where the selection results might change between selections
$("div.whatever").show(); //Get a new selection
$("div.whatever").hide(); //Get a new selection

//Use $$ where they won't
$$("div.whatever").show(); //Get a new selection the first time
$$("div.whatever").hide(); //Get it from cache