function nav(dir) {
    var postData = {
        game_id    : "{{.ActiveGame.ID}}",
        src        : $("#txtSrc").val(),
        trans      : $("#txtTrans").val(),
        untrans    : $("#untranslated").is(":checked"),
        direction  : dir,
        {{if eq .Mode 0 }} //note this should not be valid js/html syntax
            image  : VisualTranslation.getPic(),
            overlay: VisualTranslation.getData(),
        {{end}}
        tid        : trans_id,
        lang       : "{{.ActiveLang}}",
        mode       : "{{.Mode}}"
    };

    $.ajax({url: "/api/next", type: "POST", data: postData)};
}