Flyover popup works correctly but posts undefined error message

[lisounder]

This script displays a flyover box in the viewable browser screen, moving the flyover box either up or down to ensure visibility.  It functions correctly, however, the line      if (new_pos.top != old_pos.top)  posts  SCRIPT5007: 'undefined' is null or not an object error in Explorer 8 and 9.  Any suggestions appreciated.

 

Thanks.

 

var count_login = 0;

var count_hook = 0;

 

var timer_nf;

 

var old_pos;

var new_pos;

var new_top_pos;

 

 

function flyover_user_disp(user)

{

timer_nf = setTimeout(function() {

showtip(user); },

            600);

}

 

function flyover_user_h(user)

{

clearTimeout(timer_nf);

        new_pos = $("#"+user).offset();

 

        if (new_pos.top != old_pos.top) 

        {

$("#"+user).animate({top: old_pos.top}, 'fast');

        }

 

        flyover_user_hide();

}

 

function getBodyScrollTop()

{

  return self.pageYOffset || (document.documentElement && document.documentElement.scrollTop) || (document.body && document.body.scrollTop);

}

 

        function showtip(user)

        {

 

            $(".user-profile-popup").hide('fast');

            var html = document.documentElement;

 

            $("#"+user).show();

 

            var br=document.getElementById(user).getBoundingClientRect();

           

            old_pos = $("#"+user).offset();

            new_top_pos = old_pos.top;

           

            if (br.bottom > html.clientHeight)

            {

                new_top_pos = old_pos.top - $("#"+user).height() - 95;

                $("#"+user).animate({top: new_top_pos}, 'fast');

            }

 

            $("#"+user).hide();

 

            $("#"+user).animate({opacity: "show", left: br.left, top: new_top_pos}, 'fast');

        }

 

function slide()

    {

    if(count_login == parseInt(user_Info.length)-1) {

          count_login=0;

  $("#feat_member").html("<h3><span>Featured Member</span></h3>"+user_Info[count_login]);

        }

        else {

            count_login++;

$("#feat_member").html("<h3><span>Featured Member</span></h3>"+user_Info[count_login]);

        }

    }

 

    setInterval("slide()",10000);

function chage_hook()

{

    if(count_hook == parseInt(hookup.length)-1) {

            count_hook = 0;

        }

        else {

            count_hook += 1;

        }

        $("#hook_up_alert").html(hookup[count_hook]);

}

    setInterval("chage_hook()",15000);

 

 

[attachment deleted by admin]

[BlueSkyIS]

Any suggestions appreciated.

 

you might try a javascript forum instead of a php forum.