How to use keywords to filter a JSON array object?

I am trying to find a way to take an array of keywords that are user createda and filter a JSON array, and have the results appended to the screen.

Below is the actual code I am using.

var keywords= [];

var interval = "";

var pointer = '';

var scroll = document.getElementById("tail_print");



$("#filter_button").click(

function(){

    var id = $("#filter_box").val(); 

    if(id == "--Text--" || id == ""){

        alert("Please enter text before searching.");

    }else{

        keywords.push(id);

        $("#keywords-row").append("<td><img src=\"images/delete.png\" class=\"delete_filter\" /> " + id + "</td>");

    }

}

);



$(".delete_filter").click(

function(){

   ($(this)).remove(); 

}

);



function startTail(){

clearInterval(interval);

interval = setInterval(

function(){

    $.getJSON("ajax.php?function=tail&pointer=" + pointer + "&nocache=" + new Date(),

        function(data){

            pointer = data.pointer;

            $("#tail_print").append(data.log);

            scroll.scrollTop = scroll.scrollHeight;

        });

}, 1000);

}

PHP code that pulls the tailing info:

function tail(){

    $file = "/path/to/the/log/filelog.log";

    $handle = fopen($file, "r");

    clearstatcache();       



    if ($_REQUEST['pointer'] == '') {

        fseek($handle, -1024, SEEK_END);

    } else {

        fseek($handle, $_REQUEST['pointer']);

    }



    while ($buffer = fgets($handle)) { 

        $log .= $buffer . "<br />\n";

    } 



    $output = array("pointer" => ftell($handle), "log" => $log);

    fclose($handle);



    echo json_encode($output);

}

The whole purpose of this is to allow the user to filter log results. So the user performs an action that starts startTail() and $.getJSON() retrieves a JSON object that is built by a PHP function and prints the results. Works flawlessly. Now I want to give the user the option to filter the incoming tailing items. The user clicks a filter button and jQuery takes the filter text and adds it to the keywords array then the data.log from the JSON object is filtered using the keywords array and then appended to the screen.

I also have a delete filter function that isn't working. Maybe someone can help me with that.