function checkspace(checkstr) {
  var str = '';
  for(i = 0; i < checkstr.length; i++) {
    str = str + ' ';
  }
  return (str == checkstr);
}
function checklogin()
{   
	if (checkspace(document.loginform.userid.value)){
	document.loginform.userid.focus;
	document.getElementById("usernamediv").innerHTML="<font color='#FF0000'>请输入你登录的名字或电子邮件</font>";
	return false;
	}
	if(checkspace(document.loginform.userpassword.value)){
	document.loginform.userpassword.focus;
	document.getElementById("userpassworddiv").innerHTML="<font color='#FF0000'>请输入你的口令!"
	return false;
	}
}