var stage = 0
$(document).ready(function () {
        var height1 = $("#eins").height ();
        $(window).scroll(function () {
            var pos = $(this).scrollTop ();
            console.log (pos);
            if (pos+600 >= height1 && stage == 0){ moveBlobs (1000, 1000, 1)}
            else if (stage == 1 && pos < 400){ moveBlobs (0,0,0) }
        })
}
)

function moveBlobs (t, r, to) {
    var dur = 0.7
    if (stage < to) {
        $("#blobs").css ({
            'animation': 'move-down-'+ to + ' ease-in-out '+dur+ 's'
        })
    }
    else {
        $("#blobs").css ({
            'animation': 'move-down-'+(to+1)+' ease-in-out '+dur+'s reverse'
        })
    }
    setTimeout (function () {$("#blobs").css ({
        'top': t + 'px',
        'right': r + 'px',
        'animation': '0',});
        stage = to;
    }, (dur*1000)-1)
}