Pixel art generator

Check this page for more details: http://www.thingiverse.com/thing:56310

CSS

.grid {
    margin:1em auto;
    border-collapse:collapse
}
.grid td {
    cursor:pointer;
    width:30px;
    height:30px;
    border:1px solid #ccc;
    text-align:center;
    font-family:sans-serif;
    font-size:9px;
}
.grid td.clicked {
    background-color:black;
    font-weight:bold;
    color:white;
}

JavaScript

var lastClicked;
var width = 8;
var center = width / 2;
var depth = 0;
var cells = new Array(width);

var grid = clickableGrid(width, width, function (el, row, col, i) {
    switchState(el, row, col, i);
});

function switchState(el, row, col, i) {
    console.log("You clicked on element:", el);
    console.log("You clicked on row:", row);
    console.log("You clicked on col:", col);
    console.log("You clicked on item #:", i);
    if (cells[row][col] === 0) {
        cells[row][col] = 1;
        el.className = 'clicked';
    } else {
        cells[row][col] = 0;
        el.className = '';
    }
}
outputTextBox();
document.body.appendChild(grid);
showOutput();

function showOutput() {
    //[0, 0, 0]
    var output = new Array();

    for (var r = 0; r < width; ++r) {
        for (var c = 0; c < width; ++c) {
            if (cells[r][c] == 1) {
                var newElement = '[' + (r - center) + ',' + (c - center) + ',' + depth + ']';
                output.push(newElement);
            }
        }
    }
    if (output.length > 0) {
        document.getElementById('output').value = '[' + output.join() + '];';
    } else {
        document.getElementById('output').value = 'No Cells are Highlighted!';
    }
}

function outputTextBox() {
    var div1 = document.createElement('div');
    div1.id = 'mb_ad';
    div1.innerHTML = '<H2>To start using this editor:</H2>1- Draw the shape you want by clicking on the cells<BR>2- Click on the Get Array Button<BR>3- copy the text box content and paste it in the openSCAD file<br><br>';
    document.body.appendChild(div1);


    var edit = document.createElement("input");
    edit.id = 'output';
    edit.style.width = '70%';
    document.body.appendChild(edit);

    var getArray = document.createElement('button');
    getArray.innerHTML = 'Get Array!';
    getArray.onclick = function () {
        showOutput();
        return false;
    };
    document.body.appendChild(getArray);

    var clear =...