function CheckEmail(str){  if (str == ""){alert("出错：邮箱地址不能为空");return false;}
  if (str.length < 6){alert("出错：邮箱地址不合法");return false;}
  if (!(/^\w+([\.-]?\w+)*@\w+([\.-]?\w+)*(\.\w{2,3})+$/.test(str))){alert("出错：邮箱地址格式不规范");return false;}
  return true;
}
function showPay(id){
   var obj1=document.getElementById("table_online");
   var obj2=document.getElementById("table_offline");
   if(id==2){
      obj1.style.display='none';
      obj2.style.display='';
   }
   else{
      obj2.style.display='none';
      obj1.style.display='';
   }
}
function valid(){
  document.charset='gb2312';
    if (goodsform.username.value.length < 2){
       alert("出错：收货人姓名必须大于2个字符");
       goodsform.username.focus();
       return false
    }
  if (!CheckEmail(goodsform.email.value)){
     goodsform.email.focus();
     return false;}
   if (goodsform.MobilePhone.value.length < 11){
      alert("出错：11位手机号码");
      goodsform.MobilePhone.focus();
      return false;}
   if (goodsform.ReceiveAddress.value.length < 10){
     alert("出错：收货地址太简短");
     goodsform.ReceiveAddress.focus();
     return false;}
return true;}