"setting a property that has only a getter"-problem with firefox

Question

So far i was using Safari 4 for testing and debugging my current jQuery Plugin, but as i tried my code out in Firefox it started to complain about something within the JQuery-Framework: "setting a property that has only a getter". I tried to find out wich line exactly causes Firefox to complain and found out that this happens somewhere here**

$.fn.util.create_$dom = function(opt) {
 var $dom = {};
 $.each(opt.dom,function(name,val){
  console.log(name);
  var $elm = $('<div>');
  $.each(opt.dom[name],function(_name,_val){
   if(_name == 'tagName') $elm = $('<'+_val+'/>');
  });
                    console.log(name+': ok');
  $.each(opt.dom[name],function(_name,_val){             **here  
   switch(_name){                                     **here
    case 'className': $elm.addClass(_val);         **here
    default: $elm.attr(_name, _val);               **here
   }                                                  **here
  });
  $dom[name] = $elm;
  console.log(name+': ok');
 });
 return $dom;
};

options.dom looks like this:

 dom:{
  wrapper:{className:'wrapper'},
  inner:{tagName:'p',className:'test',test:'bla'}
 },

Answer 1

It looks like your trying to set the tagName of an element with this line

$elm.attr(_name, _val);

This of course is not possible as it is read only.

Answer 2

case 'tagName': break;

... is the solution, but in order to thank redsquare for the hint i marked him up.