function checkDigital(_value) {

    label   = $("#receivement_digital_label").get(0);
    sel     = $("#receivement_digital").get(0);

    if (/hoge/i.test(_value)) {
        label.style.display = "block";
        sel.disabled        = false;
    } else {
        label.style.display = "none";
        sel.disabled        = true;
    }
}

function addImage() {
    
    html    = document.getElementById("desired_image[0]").innerHTML;
    linkadd = $("#addlink").get(0);
    newid   = desired_images;
    desired_images++;
    
    //-- replace html stuff
    html = html.replace(/\[0\]/g,   "[" + newid + "]");
    html = html.replace(/1<\/h6>/i, (newid + 1) + "</h6>");
    
    //-- create new div
    newdiv              = document.createElement("div");
    newdiv.className    = "subform desired_image";
    newdiv.id           = "desired_image[" +  + "]";
    newdiv.innerHTML    = html;
    
    //-- empty input values
    inputs = newdiv.getElementsByTagName("input");
    for (i = 0; i < inputs.length; i++) {
        inputs.item(i).value     = "";
        inputs.item(i).className = "form_check";
    }
    
    //-- add to page
    linkadd.parentNode.insertBefore(newdiv, linkadd);
    
}

function toggleBilling() {
    $('#billing').slideToggle();
    var bill = $('#billing').get(0);

    if (bill.style.display == 'none') {
        bill.value  = '';
        bill.value  = '';
        bill.value     = '';
        bill.value  = '';
    }
}

function enable(_id, _boolean) {

    obj = $('#' + _id).get(0);
    obj.disabled = !_boolean;

    if (_boolean) {
        obj.focus();
    }
}