function range ( low, high, step ) {
    // http://kevin.vanzonneveld.net
    // +   original by: Waldo Malqui Silva
    // *     example 1: range ( 0, 12 );
    // *     returns 1: [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12]
    // *     example 2: range( 0, 100, 10 );
    // *     returns 2: [0, 10, 20, 30, 40, 50, 60, 70, 80, 90, 100]
    // *     example 3: range( 'a', 'i' );
    // *     returns 3: ['a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i']
    // *     example 4: range( 'c', 'a' );
    // *     returns 4: ['c', 'b', 'a']

    var matrix = [];
    var inival, endval, plus;
    var walker = step || 1;
    var chars  = false;

    if ( !isNaN( low ) && !isNaN( high ) ) {
        inival = low;
        endval = high;
    } else if ( isNaN( low ) && isNaN( high ) ) {
        chars = true;
        inival = low.charCodeAt( 0 );
        endval = high.charCodeAt( 0 );
    } else {
        inival = ( isNaN( low ) ? 0 : low );
        endval = ( isNaN( high ) ? 0 : high );
    }

    plus = ( ( inival > endval ) ? false : true );
    if ( plus ) {
        while ( inival <= endval ) {
            matrix.push( ( ( chars ) ? String.fromCharCode( inival ) : inival ) );
            inival += walker;
        }
    } else {
        while ( inival >= endval ) {
            matrix.push( ( ( chars ) ? String.fromCharCode( inival ) : inival ) );
            inival -= walker;
        }
    }

    return matrix;
}