weirdBase64.js

var Teleport = function() {};

Teleport._rixits = "0123456789" 
                 + "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
                 + "abcdefghijklmnopqrstuvwxyz"
                 + "-_";

Teleport.numberToHash = function( n ) {
    if( isNaN(Number(n)) || n===null || n===Number.POSITIVE_INFINITY || n<0 ) throw "The input is not valid";
    n = Math.floor( n );

    var result = '';
    do result = this._rixits.charAt(n%64) + result;
    while( n=Math.floor(n/64) );
    return result; // String
};


Teleport.hashToNumber = function( h ) {
    if(typeof h==="undefined") return false;
    for(var i=0, result=0; i<h.length; i++) result = (result*64) + this._rixits.indexOf(h.charAt(i));    
    return result; // Integer
};