This is an element prototype that animates the element's horizontal scroll. By default, it scrolls the element all the way over to the right, and if an integer is passed in, it animates until the element's scrollLeft property equals that integer.

HTMLElement.prototype.scrollHorizontally

	HTMLElement.prototype.scrollHorizontally = function( newScrollLeft ) {

		var self = this;

		newScrollLeft = newScrollLeft ? newScrollOffset : self.scrollWidth - self.offsetWidth

		animate();

		function animate(){

			if ( self.scrollLeft < ( newScrollLeft ) ) {

				self.scrollLeft = self.scrollLeft + 10;

				window.requestAnimationFrame(animate);

			}

		};

	};