pluralize.js

Number.prototype.pluralize = function(singular, plural) {
    var a = '', b = 's';
    if (singular && plural) { a = singular; b = plural; }
    return (this == 1) ? a : b;
};

// Examples
function cherries(numCherries) {
    alert('You have '+numCherries+' cherr'+numCherries.pluralize('y', 'ies')+' in mai bucket.');
};

cherries(3); // You have 3 cherries in mai bucket.
cherries(1); // You have 1 cherry in mai bucket.

// Combine all these little nuggets the grand finale!
foo = 3;
alert('You have '+foo.apnumber()+' cherr'+foo.pluralize('y', 'ies')+' in mai bucket.'); // You have one cherry in mai bucket.