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;
}