JavaScript: Format number/currency w/regards to culture like .NET's String.Format()?

This seems like a problem someone would've already solved in the year 2009, but I can't find a decent JavaScript library that will take a number like:

12345.58

And format it correctly based on a specific culture (ie, "nl-nl") or ISO currency code.

dojo showed promise, but it doesn't include many cultures by default, and actually wasn't working properly in my tests.

I basically want something that is 100% or near-100% equivalent to what .NET does for me, when I run:

String.开发者_开发问答Format([cultureInfo Object], "{0:N}", myValue) ' for numbers

and

String.Format([cultureInfo Object], "{0:C}", myValue) ' for currency

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The ASP.NET Ajax framework lets you do this.

Set the EnableScriptGlobalization property on the ScriptManager to true. You can then use the Number.localeFormat function to format numbers.