function checkForm(theform)
{
  if (regist.user.value.length==0)
  {
    alert("用户名不能为空。");
    mobj = eval("regist.user");
    mobj.focus()
    mobj.select()
    return false;
  }
  

   
  if (regist.user.value.length<2)
  {
    alert("对不起，用户名至少有2位。");
    mobj = eval("regist.user");
    mobj.focus()
    mobj.select()
    return false;
  }
 
  if (regist.pass.value.length==0)
  {
    alert("密码不能为空。");
    mobj = eval("regist.pass");
    mobj.focus()
    mobj.select()
    return false;
  }
   
  if (regist.pass.value.length<2)
  {
    alert("对不起，密码至少有2位。");
    mobj = eval("regist.pass");
    mobj.focus()
    mobj.select()
    return false;
  }

  if (regist.regjm1.value.length!=4)
  {
    alert("对不起，验证码必须是4位");
    mobj = eval("regist.regjm1");
    mobj.focus()
    mobj.select()
    return false;
  }   
   
  if (isNumberString(document.regist.regjm1.value,"1234567890")!=1) 
  {
    alert("对不起，验证码必须是数字");
    mobj = eval("regist.regjm1");
    mobj.focus()
    mobj.select()
    return false
  }

  if(document.regist.logon_type[0].checked==false && document.regist.logon_type[1].checked==false)
  {
    alert("请选择会员类型!");
    document.regist.logon_type[0].focus();
    return false;
  }   
  	
   return true;
}  


function isNumberString (InString,RefString)
{
if(InString.length==0) return (false);
for (Count=0; Count < InString.length; Count++)  {
	TempChar= InString.substring (Count, Count+1);
	if (RefString.indexOf (TempChar, 0)==-1)  
	return (false);
}
return (true);
}