draggable.js

    // Parameter1 HTMLElement 
    // Parameter2 callback
        var draggable = function(element, onDragFunction) {
            var mouseDownEvent;

            var onMouseMove = function (mouseMoveEvent) {
                onDragFunction(this.mouseDownEvent, mouseMoveEvent);
            }

            var addMouseDragEvent = function (mouseDownEvent) {
                this.mouseDownEvent = mouseDownEvent;
                if(typeof mouseDownEvent.target.setCapture === 'function' ){
                    mouseDownEvent.target.setCapture();
                }
                element.addEventListener('mousemove', onMouseMove);
            };

            var removeMouseMoveEvent = function () {
                element.removeEventListener('mousemove', onMouseMove);
            };

            element.addEventListener('mouseup', removeMouseMoveEvent);
            element.addEventListener('mouseleave', removeMouseMoveEvent);
            element.addEventListener('mousedown', addMouseDragEvent);
        };