Recently, I needed to write an up/down selector – you know the sort, it’s where you select a number by clicking on an up or down arrow. Since they can be useful for other things besides numbers, I gave it the plugin treatment.
Most of the information about the plugin can be found in its documentation page.
Also available is a slightly beefier styled and animated demo of the plugin.
If you’re just interested in the plugin itself, you can find it here.