Rails - Feb 2009 - How to set the selected option for a combo box?

<div>
  	    <label for="category"
class="label_left">Kategorie</label>
    	    <% @selected_category            Category.find(:first, :select =>
"name, id", :conditions =>
["id = ?",  params[''category_id'']]) %>
    	   <% @all_categories = Category.find(:all, :order =>
''id'').collect {|c| ([c.name, c.id])} %>
    	   <select name=''edition[category_id]''
id=''category''
class=''fieldStyle''  tabindex=''3''>
	    	<%= options_for_select(@all_categories, @selected_category.name)
%>
	   </select>
	</div>

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