$(document).ready(function() {
    var cnt=0, bg;
    var $slider = $('#maini');
    var arr = ['url(images/bg000.jpg) no-repeat center center','url(images/bg003_2.jpg) no-repeat top center'];

    var bgrotater = setInterval(function() {
        if (cnt==2) cnt=0;
        bg = arr[cnt];
        cnt++;
        $slider.fadeOut(2000, function() {
		$slider.css({
			'background':bg,
			'webkit-background-size':'cover',
			'moz-background-size':'cover',
			'o-background-size':'cover',
			'background-size':'cover'
              }).fadeIn(2000);
        });
    }, 14000);

//    $('#some_button_id').click(function() {
//        clearInterval(bgrotater);
//    });

});