Walenty / Slowal

    var id = "";
    function onClick(td_id) {
        if (id) {
            color(id, "", "");
        }
        id = td_id;
        color(id, "red", "green");
    }
    
    function color(what, how, self) {
        switch (what) {
            {% for ident, connected in complement_position.items %}
                case "{{ ident }}":
                    {% for i in connected|hash:0 %}
                        document.getElementById("{{ i }}").style.backgroundColor = how;
                    {% endfor %}
                    {% for i in connected|hash:1 %}
                        document.getElementById("{{ i }}").style.backgroundColor = self;
                    {% endfor %}
                    break;
            {% endfor %}
        }
    }