$(function(){

	// ***
	// Scrolling background
	// ***
		
	// height of background image in pixels
	var backgroundheight = 4000;
	
	// get the current minute/hour of the day
	var now = new Date();
	var hour = now.getHours();
	var minute = now.getMinutes();
	
	// work out how far through the day we are as a percentage - e.g. 6pm = 75%
	var hourpercent = hour / 24 * 100;
	var minutepercent = minute / 60 / 24 * 100;
	var percentofday = hourpercent + minutepercent;
	
	// calculate which pixel row to start graphic from based 
	//on how far through the day we are
 	var startoffset = backgroundheight / 100 * percentofday;

	// graphic starts at approx 6am, so adjust offset by 1/4
	// scratch that, IE doesnt like negaive starts.. TODO: find a better way.
	// var startoffset = 0;
	
	// end 1x background height after the start offset so we get a smooth loop
	var endoffset = startoffset + backgroundheight;
	
   	function scrollbackground() {
		// set the background start position
		$('body').css({
			backgroundPosition: '50% -' + startoffset + 'px'
		});
		// animate through to the end
		$('body').animate({
			backgroundPosition:'(50% -' + endoffset + 'px)'
			},
			100000,
			"linear",
			function () {
				// callback to self to loop animation
				scrollbackground();
			}
		);
	}
   
	// start the animation
	scrollbackground();
	
});