Javascript String hexDecode8()

String.prototype.hexDecode8 = function(){
    var j;/*from  w  w  w . j a va 2 s  .c  o  m*/
    var hexes = this.match(/.{1,2}/g) || [];
    var back = "";
    for(j = 0; j<hexes.length; j++) {
        back += String.fromCharCode(parseInt(hexes[j], 16));
    }
    return back;
}