jQuery 1.6.1, HTML, CSS, JavaScript
Mootools 1.3.2, HTML, CSS, JavaScript
Change the value of an input based on link clicking. Useful for a "switch" (on/off) graphical representation, for example.
jQuery 1.5.2, HTML, CSS, JavaScript
jQuery 1.5, HTML, CSS, JavaScript
jQuery 1.4.4, HTML, CSS, JavaScript
Doesn't get much simpler than this.