"Disallowed Key Characters" for HTML content - even using $_POST?!

[eluser]Dojjjan[/eluser]
I have the same problem here but i didn't understand how you soloved it?

I use tinyMCE and tinyMCE imagemanager for making posts to a blog and i what to use jquerys ajax function for submiting the form. But i get "Disallowed Key Characters" for the html that tinyMCE produces. It works just fine without the ajaxfunction and i dont what to use the $this->db->escape() function because it messes up the html when it gets displayed on the blog (is there an unescape function that i don know about? im new to codeigniter).

this is the jquery ajaxfunction i use.

Code:

$('#blog_save_btn').click(function(){
        var headline = tinyMCE.get('blog_headline').getContent();
        var content = tinyMCE.get('blog_content').getContent();

        $('#blog_site').html('<br/><center><img src="assets/images/ajax-loader.gif" style="border:0;"/> Laddar poster...</center>');
        var data_string = "save=true&blog;_headline="+headline+"&blog;_content="+ content;
    
        $.ajax({
                   type: "POST",
                   url: "&lt;?php echo base_url();?&gt;index.php/edit_vidga/blogpost_ajax_save",
                   dataType: "html",
                   data: data_string,
                   cache: false,
                
                   success: function(response){
                        $("#blog_site").html(response);    
                         tinyMCE.get('blog_headline').setContent("");
                         tinyMCE.get('blog_content').setContent("");    
                            add_handlers();        
                       }
                 });

        $("#make_posts").slideUp("slow");
        return false;
    });

How did you guys sollove this problem? did you escape the datastring with $this->db->escape()? and if so how did you get the html not to break when the data in the database is displayed on the webpage again?