Wrapped in a function and accounting for the number being longer than the 
mask:

*function numFmt(num, mask) {*
* return (mask + num).slice(-Math.max(mask.length, (num + "").length));*
*};*

Thanks Brandon, 2 1/2 years later :P

Adrian

On Thursday, 29 March 2012 12:39:33 UTC+1, Brandon Benvie wrote:
>
> ("0000" + someNumber).slice(-4)
>
>

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