function drawShape() {

// get the canvas element using the DOM

var canvas = document.getElementById('tutorial');

  // Make sure we don't execute when canvas isn't supported

  if (canvas.getContext){

    // use getContext to use the canvas for drawing

    var ctx = canvas.getContext('2d');

    // Draw shapes

    ctx.beginPath();

    ctx.moveTo(75,40);

    ctx.bezierCurveTo(75,37,70,25,50,25);

    ctx.bezierCurveTo(20,25,20,62.5,20,62.5);

    ctx.bezierCurveTo(20,80,40,102,75,120);

    ctx.bezierCurveTo(110,102,130,80,130,62.5);

    ctx.bezierCurveTo(130,62.5,130,25,100,25);

    ctx.bezierCurveTo(85,25,75,37,75,40);

    ctx.fill();

    ctx.globalAlpha = 0.5;

 }

}

drawShape();