var i;
		var ctx;
		var width;
		var height;
		var xdiamond = new Array(80,140,150);
		var ydiamond = new Array(80,80,120);
		var xmove = new Array(1,2,2);
		var ymove = new Array(2,1,2);
		var colour = new Array("#000","#666","#aaa");
		function init() {
  			ctx = $('#canvas')[0].getContext("2d");
  			width = $("#canvas").width();
  			height = $("#canvas").height();
  			return setInterval(draw, 50);
		}
		function diamond () {
			ctx.beginPath();
    		ctx.moveTo(xdiamond[i],ydiamond[i]);
    		ctx.lineTo((xdiamond[i] + 50),(ydiamond[i] - 50));
    		ctx.lineTo((xdiamond[i] + 100),ydiamond[i]);
    		ctx.lineTo((xdiamond[i] + 50),(ydiamond[i] + 50));
    		ctx.closePath();
    		ctx.stroke();
		}
		function clear() {
  			ctx.clearRect(0, 0, width, height);
		}
        function draw() {
  			clear();
				for (i=0;i<xdiamond.length;i++){
				ctx.lineWidth = 3;
				diamond();
				ctx.strokeStyle = colour[i];
	  			if (xdiamond[i] + xmove[i] > 330 || xdiamond[i] + xmove[i] < 0)
	    			xmove[i] = -xmove[i];
	  			if (ydiamond[i] + ymove[i] > 280 || ydiamond[i] + ymove[i] < 50)
	    			ymove[i] = -ymove[i];
	  			xdiamond[i] += xmove[i];
	  			ydiamond[i] += ymove[i];
				}
		}
		$(function(){init();});
		$(function(){draw();});