var mod = 10;

var total = mod*mod;

var spred = .14;

var dec = .5;

for(var a=0;a<total;a++){

   $("#stuff").append('<div class="thing"></div>');

}

function ping(){

 $(".thing:nth-child("+(Math.floor(Math.random()*total)+1)+")").attr("val", 255);

}

function run(){

 if (Math.random() < .2)

       ping();

 $(".thing").each(function (i){

   var val = parseInt($(this).attr("val"));

   if (val > 0){

     var s = val*spred;

     var prev = i-1;

     if (prev < 0)

           prev = total-1;

     update(prev, s);

     var up = i-mod;

     if (up < 0)

           up = total+up;

     update(up, s);

     var down = i+mod;

     if (down > total)

           down = down-total;

     update(down, s);

     var next = i+1;

     if (next >= total)

           next = 0;

     update(next, s);

     update(i, val*dec, true);

   }

 });

}

function update(index, value, full){

 if (typeof full == "undefined")

   full = false;

 var div = $(".thing:nth-child("+(index+1)+")");

 if (full)

       var val = Math.floor(value);

 else

       var val = Math.floor(parseInt(div.attr("val")) + value);

 if (!val)

       val = 0;

 if (val > 255)

       val = 255;

 div.attr("val", val);

 var color = 255-val;

 div.css("background-color", "rgb("+color+","+color+","+color+")");

}

setInterval(function (){ run(); }, 60);