Creating plugins for jQuery is trivially easy and can help you:

• clean up your javascript in individual applications
• share re-used javascript between multiple applications
• share your snazzy jQuery voodoo with others!

1 $.fn.color = function(color){
2   return this.each(function(){
3     $(this).css('color', color);
4   });
5 };
6 
7 $('a').color('red').css('font-weight', 'bold');
8 
9 (function($){ ... }){jQuery)