$("#exercise_head_show").html("<%= escape_javascript(render :partial => 'show_head') %>");
$("#exercise_head_edit").html("<%= escape_javascript(render :partial => 'edit_head') %>");
$("#exercise_head_edit").hide();
$("#exercise_head_show").show();
$("#new_exercise_question").html("<%= escape_javascript(render :partial => 'exercise/new_question') %>");