jQuery条件字段验证（必须至少填写两个字段中的一个）

我甚至无法测试这在JSFIDLE中是否有效，因为我在尝试提交表单时不断收到错误消息：

{"error": "Shell form does not validate{'html_initial_name': u'initial-js_lib', 'form': <mooshell.forms.ShellForm object at 0x3ff9310>, 'html_name': 'js_lib', 'html_initial_id': u'initial-id_js_lib', 'label': u'Js lib', 'field': <django.forms.models.ModelChoiceField object at 0x3ff82d0>, 'help_text': '', 'name': 'js_lib'}{'html_initial_name': u'initial-js_wrap', 'form': <mooshell.forms.ShellForm object at 0x3ff9310>, 'html_name': 'js_wrap', 'html_initial_id': u'initial-id_js_wrap', 'label': u'Js wrap', 'field': <django.forms.fields.TypedChoiceField object at 0x3ff8390>, 'help_text': '', 'name': 'js_wrap'}"}

和html：

<form id="signup" method="post" action="">
<div><label >Name</label>
        <input  id="custom-105958"  name="custom-105958" type="text"></div>
    <div><label >Birthday (mm/dd/yy)</label>
        <input  id="custom-105959"  name="custom-105959" type="text"></div>

    <div><label >Personal Identification Number (PIN)</label>
        <input  id="custom-105976" name="custom-105976" type="text">  </div>    
    <input type="submit" value="Submit" />


</form>

名称
生日（月/日/年）
个人识别码（PIN）

编辑：

function Validate() {
    var customfirst = document.getElementById('custom-105959').value;
    var customsecond = document.getElementById('custom-105976').value;
    if (customfirst == '' && customsecond == ''){
        alert('empty');   
    }
    else {
        alert('inserted');   
    }
}

function Validate() {
    var customfirst = document.getElementById('custom-105959').value;
    var customsecond = document.getElementById('custom-105976').value;
    if (customfirst == '' && customsecond == ''){
        alert('empty');   
    }
    else {
        alert('inserted');   
    }
}