function docheck(){
  if (loginForm.username.value==""){
	alert("请输入用户名!");
	loginForm.username.focus();
	return false;
  }
  if (loginForm.password.value==""){
	alert("请输入密码!");
	loginForm.password.focus();
	return false;
  }
  loginForm.username.value=loginForm.username.value.toLowerCase();
  //loginForm.submit();
  return true;
}
function docheck2(){
  if (loginForm2.username.value==""){
	alert("请输入用户名!");
	loginForm2.username.focus();
	return false;
  }
  if (loginForm2.password.value==""){
	alert("请输入密码!");
	loginForm2.password.focus();
	return false;
  }
  loginForm2.username.value=loginForm2.username.value.toLowerCase();
  //loginForm2.submit();
  return true;
}