Converting Longitude and Latitude to Google Image Tiles Javascript

I am trying to get this code to work in the Acrobat JavaScript api. I keep getting 0,0 as the result. Any help would be appreciated.

lat = 65.06518345;
lon = -146.09069824;
zoomLevel = 17;


function getXYfromLatLon(lat, lon, zoomLevel) {
var lon = 180.0 + lon;
var x = Math.floor( (lon / 360.0) * 131072 );
/* 2^17 = 131072 */
x >>= zoomLevel;
var lat = lat / 180.0 * 3.1415926;
var y = Math.PI - 0.5 * Math.log((1+Math.sin(lat))/(1-Math.sin(lat)));
y = Math.floor( (y / 2 / Math.PI) * 131072 );
y >>= zoomLevel;
return new Array(x,y);
}


getXYfromLatLon(lat, lon, zoomLevel)