Need help fixing error

[lisounder]

If (new_pos.top != old_pos.top)    this line keeps posting an error on Explorer 8 and 9, but not Firefox, Opera, or Sarfari ... please help.

 

 

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();
}

[lisounder]

Added an image capture of the error message.

 

[attachment deleted by admin]