You Can't style the content of a text area separately, you have to use <div>s, or something similar. This may be a duplicate of:
Format text in a <textarea>?
Do you Want Something like this:?
http://jsfiddle.net/mekwall/XNkDx/
$('.editable').each(function(){
this.contentEditable = true;
});
this allows you to edit the content of a div, and it will still look like a textarea,
Bold Works.