jsDatePick is an easy to use JavaScript date picker that uses DOM techniques to generate its HTML code. You can attach date picker as a popup or appended directly to the field. It does not rely on any JavaScript library and works in all major web browsers.
jsDatePick is very simple and easy to implement. It allows users to quickly browse both years and months, and provide you the ability to set range for years. You can customize its look and feel via CSS or simply specify one of the available color schemes to match your design.
Developed by Itamar Arjuan; jsDatePick is available for download under GNU General Public License. You can find further information, demo & download on jsDatePick Website.
Seems to be a good plugin, if we are not using any libraries.
Just to mention, i tried the demo on the site, it seems that css is not working in IE, well I just tried in my IE7. Specially the css around the dates.
yes, it doesn´t work with Internet Explorer (I tried in IE8) :S but with FireFox it looks great!