$(document).ready(function(){
$("#persFlash").css({"top": $(window).scrollTop() + $(window).height() - 400});

$(window).scroll(function(){    
    
    var scrollBottom = $(window).scrollTop() + $(window).height() - 400;
    $("#persFlash").css({"top": scrollBottom});   
});

});

function quit()
{
    if (document.getElementById("pers")) {
          var child = document.getElementById("persFlash");
          var parent = document.getElementById("pers");
          parent.removeChild(child);
    }
}