Checkbox Event Handler
#myGroup {visibility:hidden}
function toggle(chkbox, group) {
var visSetting = (chkbox.checked) ? "visible" : "hidden";
document.getElementById(group).style.visibility = visSetting;
}
function swap(radBtn, group) {
var modemsVisSetting = (group == "modems") ? ((radBtn.checked) ? "" : "none") : "none";
document.getElementById("modems").style.display = modemsVisSetting;
}