A javascript function to fire off quartile tracking pixels when called.

quartile_pixels

<script>
function bt(btNum){
    // generate a random number
    var pndrnd=Math.floor(Math.random()*10000000000);
 
    // Enter the list of pixels below. Remove any extra entries below.
    var btPixel=new Array();
    btPixel[0]="http://www.pxl.com/0/ord="+pndrnd+"?";
    btPixel[25]="http://www.pxl.com/25/ord="+pndrnd+"?";
    btPixel[50]="http://www.pxl.com/50/ord="+pndrnd+"?";
    btPixel[75]="http://www.pxl.com/75/ord="+pndrnd+"?";
    btPixel[100]="http://www.pxl.com/100/ord="+pndrnd+"?";
    btPixel['btUnmute']="http://www.pxl.com/unmute/ord="+pndrnd+"?";
 
    // Fire the pixel
    var img = document.createElement("img");
    img.setAttribute("src", btPixel[btNum]);
    img.setAttribute("style", "display:none");  
    document.body.appendChild(img);
}
</script>