function visualToggle(id, swt) {
    if (document.getElementById(id).style.display == "" || document.getElementById(id).style.display == "none") {
        document.getElementById(id).style.display = "block";
        document.getElementById(swt).innerHTML = "–";
    } else {
        document.getElementById(id).style.display = "none";
        document.getElementById(swt).innerHTML = "+";
    }
}