René, 

 

You can use the following code to get the editor:
 
var editor1=document.getElementById('<%=Editor1.ClientID%>');

var editor1doc = editor1.GetDocument();

Now you can get the selection and write your JavaScript code:
 

For example:

var sel =  editor1.GetSelection();

if(sel.type=='Control')
{
    // put your code here...
       ......... 

}

else

{
    // put your code here...
       ......... 
}