I replace an element with another element:

3. $("iframe").each(function(){
4. var frame=$(this);
5. $(this).contents().find("div").each(function(){
6. var ID=$(this).attr('pid');
7.     var span=document.createElement("span");
8.     span.innerHTML=$(this).html();    
9.     span.setAttribute('pid',ID);
10.     $(this).replaceWith( $(span) );
11.        });
12. });

The div disappears. However, if after this I make a find in frame contents, with a scrollTo to each find it moves to the disappeared div, despite not being there. Does the frame keeps the reference of the replaced object? How to get rid of it?