Change:

 

   var editor = document.getElementById("CE_Editor_ID")
   var editDoc = editor.GetDocument();
   editor.FocusDocument();
   editor.SetHTML(document.getElementById("temp").value);

 

to:

 

   var editor = document.getElementById("<%=Editor1.ClientID%>")
   
alert(editor .getHTML());

   var editDoc = editor.GetDocument();                                                            
   editor.FocusDocument();

   editor.SetHTML(document.getElementById("temp").value);

 

Then try again.