Javascript: Fastclick

JS Fastclick

function FastButton(element, handler) {
           this.element = element;
           this.handler = handler;
           element.addEventListener('touchstart', this, false);
        };
        FastButton.prototype.handleEvent = function(event) {
           switch (event.type) {
              case 'touchstart': this.onTouchStart(event); break;
              case 'touchmove': this.onTouchMove(event); break;
              case 'touchend': this.onClick(event); break;
              case 'click': this.onClick(event); break;
           }
        };
        FastButton.prototype.onTouchStart = function(event) {
            event.stopPropagation();
           this.element.addEventListener('touchend', this, false);
           document.body.addEventListener('touchmove', this, false);
           this.startX = event.touches[0].clientX;
           this.startY = event.touches[0].clientY;
          isMoving = false;
        };
        FastButton.prototype.onTouchMove = function(event) {
           if(Math.abs(event.touches[0].clientX - this.startX) > 10 || Math.abs(event.touches[0].clientY - this.startY) > 10) {
              this.reset();
           }
        };
        FastButton.prototype.onClick = function(event) {
           this.reset();
           this.handler(event);
           if(event.type == 'touchend') {
              preventGhostClick(this.startX, this.startY);
           }
        };
        FastButton.prototype.reset = function() {
           this.element.removeEventListener('touchend', this, false);
           document.body.removeEventListener('touchmove', this, false);
        };
        function preventGhostClick(x, y) {
           coordinates.push(x, y);
           window.setTimeout(gpop, 2500);
        };
        function gpop() {
           coordinates.splice(0, 2);
        };
        function gonClick(event) {
           for(var i = 0; i < coordinates.length; i += 2) {
              var x = coordinates[i];
              var y = coordinates[i + 1];
              if(Math.abs(event.clientX - x) < 25 && Math.abs(event.clientY - y) < 25) {
                 event.stopPropagation();
                 event.preventDefault();
              }
           }
        };
        document.addEventListener('click', gonClick, true);
        var coordinates = [];
        function initFastButtons() {
          new FastButton(document.getElementById("fastclick"), goSomewhere);
        };
        function goSomewhere() {
          var theTarget = document.elementFromPoint(this.startX, this.startY);
          if(theTarget.nodeType == 3) theTarget = theTarget.parentNode;

        var theEvent = document.createEvent('MouseEvents');
        theEvent.initEvent('click', true, true);
        theTarget.dispatchEvent(theEvent);
};