//case sensitive array search
    function arr__exists(value, search_array){
        for (var i = 0; i < search_array.length; i++){
            if(search_array[i] == value) return true;
        }
        return false;
    } 

    //case isensitive  array search  
    function arr__exists_i(value, search_array){
        for (var i = 0; i < search_array.length; i++){
            if(lower_case(search_array[i]) == lower_case(value)) return true;
        }
        return false;
    }