var positions = new Array;
	positions[0] = "0px";
	positions[1] = "-721px";
	positions[2] = "-1442px";
	positions[3] = "-2163px";
var randomnumber;

function getRandomPosition(){
	randomnumber=Math.floor(Math.random()*4);
	$('#aboutcontactusheaderslider').css({
		'left': positions[randomnumber]
	});
	$('#aboutcontactusheaderslider').find('.headerimages').fadeIn(400);
}

window.onload=getRandomPosition;
	
function changeHeaderImg(){
	if (randomnumber > 0) {
		randomnumber = randomnumber - 1;
		$('#aboutcontactusheaderslider').animate({left: positions[randomnumber]}, 800);
		
	} else {
		
		$('#aboutcontactusheaderslider').fadeOut(500, function(){
			$('#aboutcontactusheaderslider').css({
				"left": "-2163px"
			});
			$('#aboutcontactusheaderslider').fadeIn(500);
			randomnumber = 3;
			
		});
	}
}

window.setInterval(changeHeaderImg, 6000);