text: (function() {
  
      var width, height, largeHeader, canvas, ctx, circles, target, animateHeader = true;
  
      // Main
      initHeader();
      addListeners();
  
      function initHeader() {
          width = window.innerWidth;
          height = window.innerHeight;
          target = {x: 0, y: height};
  
          largeHeader = document.getElementById('large-header');
          //largeHeader.style.height = height+'px';
  
          canvas = document.getElementById('demo-canvas');
          canvas.width = width;
          canvas.height = height;
          ctx = canvas.getContext('2d');
  
          // create particles
          circles = [];
          for(var x = 0; x < width*0.5; x++) {
              var c = new Circle();
              circles.push(c);
          }
          animate();
      }
  
      // Event handling
      function addListeners() {
          window.addEventListener('scroll', scrollCheck);
          window.addEventListener('resize', resize);
      }
  
      function scrollCheck() {
          if(document.body.scrollTop > height) animateHeader = false;
          else animateHeader = true;
      }
  
      function resize() {
          width = window.innerWidth;
          height = window.innerHeight;
          largeHeader.style.height = height+'px';
          canvas.width = width;
          canvas.height = height;
      }
  
      function animate() {
          if(animateHeader) {
              ctx.clearRect(0,0,width,height);
              for(var i in circles) {
                  circles[i].draw();
              }
          }
          requestAnimationFrame(animate);
      }
  
      // Canvas manipulation
      function Circle() {
          var _this = this;
  
          // constructor
          (function() {
              _this.pos = {};
              init();
          })();
  
          function init() {
              _this.pos.x = Math.random()*width;
              _this.pos.y = height+Math.random()*100;
              _this.alpha = 0.1+Math.random()*0.3;
              _this.scale = 0.1+Math.random()*0.3;
              _this.velocity = Math.random();
          }
  
          this.draw = function() {
              if(_this.alpha <= 0) {
                  init();
              }
              _this.pos.y -= _this.velocity;
              _this.alpha -= 0.0004;
              ctx.beginPath();
              ctx.arc(_this.pos.x, _this.pos.y, _this.scale*10, 0, 2 * Math.PI, false);
              ctx.fillStyle = 'rgba(255,255,255,'+ _this.alpha+')';
              ctx.fill();
          };
      }
  
  })();