var val   = '';
var label = '';

function input_check_query(form) {
    only_ja_dx = form.only_ja_dx;
    val = only_ja_dx.value;
    label = 'only JA-DX spots';
    check_length('n', null, null, null, null);

    if (ERR.length>0) {
        alert(ERR.join("\n"));
        ERR=new Array();
        return;
    }

    form.submit();
}