JavaScript TicTacToe if... Winner detection

Question

I just have a small problem.

The final assignment in my computer science class is to write a game of Tic-Tac-Toe in JavaScript. The game works by clicking on cells within a table and using a function() to switch the img source (a blank image until clicked on) to an X or an O. It's just about done, but there's one thing I can't get.

The game is played, obviously, by two players. The last thing I need is to get it (a function) to detect when a player wins and kill the script when this happens. I just can't figure this out. I know it involves if statements, and I've attempted several different codes, but everything I code just breaks the game.

I do see that this question has been asked before, and I've tried clicking on several links in the 'similar questions' box to the right, but all of them are in languages I haven't learned anything about (such as C#).

Here is my script:

<script type="text/javascript" charset="ISO-8859-1">
function placeMove(value)
{
    if (document.getElementById(value).src.indexOf("FC")!=-1) //"FC" because of the FC contained in the file name. I intended for it to stand for "free cell", for easy indentification.
    {
        var turn = document.getElementById("playerturn").innerHTML;
        if (turn == "X")
        {
            document.getElementById(value).src="../Images/TicTacToeX.jpg";
            document.getElementById("playerturn").innerHTML="O";
        }
        if (turn == "O")
        {
            document.getElementById(value).src="../Images/TicTacToeO.jpg";
            document.getElementById("playerturn").innerHTML="X";
        }
    }
    else
    {
        window.alert("Tile is in use. Please select another tile.");
    }
}
function detectWin()
{

}
</script>

This is the table that the game takes place in, if it helps:

<table class="gametable" id="gametable" border="1">
<tr>
    <td><img onclick="placeMove('r1c1')" id="r1c1" class="blank" alt="blank space" src="../Images/TicTacToeFC.jpg"></img></td>
    <td><img onclick="placeMove('r1c2')" id="r1c2" class="blank" alt="blank space" src="../Images/TicTacToeFC.jpg"></img></td>
    <td><img onclick="placeMove('r1c3')" id="r1c3" class="blank" alt="blank space" src="../Images/TicTacToeFC.jpg"></img></td>
</tr> 
<tr>
    <td><img onclick="placeMove('r2c1')" id="r2c1" class="blank" alt="blank space" src="../Images/TicTacToeFC.jpg"></img></td>
    <td><img onclick="placeMove('r2c2')" id="r2c2" class="blank" alt="blank space" src="../Images/TicTacToeFC.jpg"></img></td>
    <td><img onclick="placeMove('r2c3')" id="r2c3" class="blank" alt="blank space" src="../Images/TicTacToeFC.jpg"></img></td>
</tr>
<tr>
    <td><img onclick="placeMove('r3c1')" id="r3c1" class="blank" alt="blank space" src="../Images/TicTacToeFC.jpg"></img></td>
    <td><img onclick="placeMove('r3c2')" id="r3c2" class="blank" alt="blank space" src="../Images/TicTacToeFC.jpg"></img></td>
    <td><img onclick="placeMove('r3c3')" id="r3c3" class="blank" alt="blank space" src="../Images/TicTacToeFC.jpg"></img></td>
</tr>
</table>

The assignment is due tomorrow, and all I need is this last little bit of code.

Any help is greatly appreciated. This is my last assignment of the semester.

Thanks,

Kyle

EDIT: After some suggestions, here is what I've been trying. Entering this code will not allow the game to be played. If it's just a matter of missing semicolons, please forgive me. It involves setting the img source in each cell to a variable, and checking to see if those variables match.

There are 9 variables I created, one for each cell/X or O image:

var pic1 = document.getElementById("r1c1").src;
var pic2 = document.getElementById("r1c2").src;
var pic3 = document.getElementById("r1c3").src;
var pic4 = document.getElementById("r2c1").src;
var pic5 = document.getElementById("r2c2").src;
var pic6 = document.getElementById("r2c3").src;
var pic7 = document.getElementById("r3c1").src;
var pic8 = document.getElementById("r3c2").src;
var pic9 = document.getElementById("r3c3").src;

This is at the very end of the first script:

function detectWin()
{
if (var pic1 == var pic2 && var pic3)
{
window.alert("Game won. Please reset the game.");
}
}

This obviously only detects a win for the first row. If I can get this to work, I'll know what the rest of the code will have to be. I still don't know how to kill the script, though.

Edited to remove some unnecessary remarks and grammatical errors.

Answer 1

I write from begining code where you can check my version of checking who win game. Dont downvote if my version of game is another than you. I just want to show you how you can write code without knowledge of any algorithm.

You just need motivation. Don't give up next time so fast.

jsFiddle

My version for checking who win:

var checkResult = function(){
    $("table tr").each(function(i, val){
        $(this).find('td').each(function(j, val2){
            arr[i][j] = parseInt($(this).attr("data-points"));
        });
    });

    for(var i = 0; i<3;i++){
        var rowSum = 0;
        for(var j = 0; j<3;j++){
            rowSum += arr[i][j];
        }
        if(rowSum === 3)
            alert("Circle WIN!");
        else if(rowSum === -3)
            alert("Cross WIN!");
    }

    for(var i = 0; i<3;i++){
        var colSum = 0;
        for(var j = 0; j<3;j++){
            colSum += arr[j][i];
        }
        if(colSum === 3)
            alert("Circle WIN!");
        else if(colSum === -3)
            alert("Cross WIN!");
    }

    if(arr[0][0] + arr[1][1] + arr[2][2] === 3)
        alert("Circle WIN!");
    else if(arr[0][0] + arr[1][1] + arr[2][2] === -3)
        alert("Cross WIN!");

    if(arr[2][0] + arr[1][1] + arr[0][2] === 3)
        alert("Circle WIN!");
    else if(arr[2][0] + arr[1][1] + arr[0][2] === -3)
        alert("Cross WIN!");
};