//登陆窗口的文本框验证
function submitcheck(form1) 
{ 
if (form1.username.value=='') {alert('请输入您的注册帐号！'); form1.username.focus(); return false;} 
if  (form1.password.value=='') {alert('请输入管理密码！'); form1.password.focus(); return false;} 
else return true;
}
//登陆窗口的文本框验证