Array.prototype.uniq = function () {
        var b={};
    var brr;
    for(var i=0;i<this.length;i++){
        if(!b[this.indexof(i)])
            b[this.indexof(i)]=1;
            }
      else 
         b[this.indexof(i)]++;
     for(var p in b){
            brr.push(p);
     }
      return brr;
}