Change funtion InputURL to:

 

 

                function InputURL()
                {
                    var editor1 = document.getElementById('CE_Editor1_ID');
                    var editdoc = editor1.GetDocument(); 
                    var links = editdoc.getElementsByTagName("a");
                  if(links.length>0&&links[links.length-1].href!="") 
                    { 
                      document.getElementById("docFld").value = links[links.length-1].getAttribute("href_cetemp");
                    } 
                    else
                    {
                      setTimeout(InputURL,500);
                    } 
                }