jquery plugin

many plugin
http://www.noupe.com/jquery/50-amazing-jquery-examples-part1.html


horizontal menu :

http://www.gmarwaha.com/blog/category/client-side/jquery/

vertical menu

http://blog.evaria.com/wp-content/themes/blogvaria/jquery/index-multi.php

validation

http://jqueryvalidation.org/

choice color

http://acko.net/blog/farbtastic-jquery-color-picker-plug-in/

prev and next

http://www.malsup.com/jquery/cycle/int2.html

tool tips

http://www.codylindley.com/blogstuff/js/jtip/