There is an option of document.execCommand I had not seen and which works fine with Firefox, Chrome and IE, removeformat:
nicEditors.findEditor('myInstance1').nicCommand('removeformat', null)
This calls that function:
nicCommand : function(cmd,args) {
document.execCommand(cmd,false,args);
}
removeformat allows to remove all tags of the selected text. This remove as well as <b>
as <i>
as <u>
as <font>
. That's fine for me. :-)