$(window).load(function(){

	var timer;

	var slider = function slideImage() {
	
		var actualPosition = $('#mikolaj').css('backgroundPosition');

		var posY;

		if ( $.browser.msie && $.browser.version < 9 )
			posY = $('#mikolaj').css('background-position-y');
		else {
			posY = actualPosition.substring(4, actualPosition.length-2);
		}
		posY = Math.abs( parseInt(posY) );
		posY += 400;
		if ( posY == 1600 ) { posY = 0; }

		
		var newPos = "0px -"+posY+"px";
		
		if ( $.browser.msie && $.browser.version < 9 )
			$('#mikolaj').css('background-position-y', "-"+posY+"px" );
		else
			$('#mikolaj').css('backgroundPosition',newPos);

		timer = setTimeout( slider, 250 );
	}
	
	slider();


});