var cbvis = false;
var cbload = false;

function togglecbox () {
var cbdiv = document.getElementById(“cboxdiv”);

if (!cbvis) {
if (!cbload) {
cbdiv.innerHTML = ”;
cbload = true;
}
cbdiv.style.display = “block”;
}
else {
cbdiv.style.display = “none”;
}
cbvis = !cbvis;
}

<!– move the next line to the bottom of your to defer the loading of your Cbox –>
togglecbox();