JQuery Numeric Spinner Autorounding

I am looking for a numeric spinner that has a property for incremental value (.25, .5, .75), supports auto-rounding in case someone types in a value (or an change event), max and min ranges, and support for custom images would be great.

This is a sample/demo of the page with the controls I plan on using http://jsfiddle.net/NwHGw/. I plan on adding a spinner to the lunch input box. I'm fairly new to JQuery so if this is a matter of just tying together a few different techniques please let me know. The plugin that is being used in this sample is jQuery Time Entry by Keith Wood.

Thanks for your help

Update (12/6 9:22 PM EST): I have made an update to the code http://jsfiddle.net/NwHGw/1/. I was wondering what everyone thought of this implent开发者_开发知识库ation. The box I'm having issues with is the 'Lunch' box. It was originally going to be an decimal (1, 1.5, 2.25, ect), but if I use the same plugin as the time controls then I can specify the input as HH:MM, set the type to 24H and limit the input to say 00:00 to 03:00 and keep the rest of the logic the same. I can then do the decimal conversion on the backend.