function checkMInput()
{
	var username = document.getElementById("username")
	var password = document.getElementById("password")
	var login = document.getElementById("mlogin")
	var loginSelect = document.getElementById("loginSelect").value
	if ( username.value == "" )
	{
		alert("请输入用户名！") ;
		username.focus() ;
		return false;
	}
	if ( loginSelect == "please" )
	{
		alert("请选择邮箱！");
		return false;
	}
	if ( loginSelect == "qq" )
	{
		username.name = "uin";
		password.name = "pp";
		login.action = "http://mail.qq.com/cgi-bin/loginpage";
	}
	if ( loginSelect == "foxmail" )
	{
		username.name = "clientuin";
		password.name = "p";
		login.action = "http://www.foxmail.com/cgi-bin/loginpage";
	}
	if ( loginSelect == "163" )
	{
		username.name = "username";
		password.name = "password";
		login.action = "https://reg.163.com/logins.jsp?url=http://fm163.163.com/coremail/fcg/ntesdoor2?lightweight=1&";
	}
	if ( loginSelect == "163vip" )
	{
		username.name = "username";
		password.name = "password";
		login.action = "http://vip.163.com/logon.m?language=-1&style=-1&enterVip=true";
	}
	if ( loginSelect == "126" )
	{
		username.name = "user";
		password.name = "pass";
		login.action = "https://entry.mail.126.com/cgi/login?redirTempName=https.htm&hid=10010102&lightweight=1&language=0&style=";
	}
	if ( loginSelect == "188" )
	{
		username.name = "user";
		password.name = "pass";
		login.action = "http://reg.mail.188.com/servlet/coremail/login?";
	}
	if ( loginSelect == "yeah" )
	{
		username.name = "user";
		password.name = "pass";
		login.action = "http://entry.yeah.net/cgi/login?hid=10010102&verifycookie=1&language=0&style=0";
	}
	if ( loginSelect == "sina" )
	{
		username.name = "u";
		password.name = "psw";
		login.action = "http://mail.sina.com.cn/cgi-bin/login.cgi";
	}
	if ( loginSelect == "sinavip" )
	{
		username.name = "user";
		password.name = "pass";
		login.action = "http://vip.sina.com.cn/cgi-bin/login.cgi";
	}
	if ( loginSelect == "sohu" )
	{
		username.name = "username";
		password.name = "passwd";
		login.action = "http://login.mail.sohu.com/servlet/LoginServlet";
	}
	if ( loginSelect == "sohunet" )
	{
		username.name = "id";
		password.name = "password";
		login.action = "http://mail.sohu.net/control/login";
	}
	if ( loginSelect == "21cn" )
	{
		username.name = "UserName";
		username.value += "@21cn.com"; 
		password.name = "passwd";
		login.action = "http://passport.21cn.com/maillogin.jsp";
	}
	if ( loginSelect == "21cnnet" )
	{
		username.name = "LoginName1";
		username.value += "@21cn.net"; 
		password.name = "passwd";
		login.action = "http://webmail.21cn.net/nature/gb/NULL/NULL/NULL/SignIn.gen";
	}
	if ( loginSelect == "263" )
	{
		username.name = "usr";
		password.name = "pass";
		login.action = "http://g2wm.263.net/xmweb";
	}
	if ( loginSelect == "tom" )
	{
		username.name = "user";
		password.name = "pass";
		login.action = "http://bjweb.mail.tom.com/cgi/163/login_pro.cgi";
	}
	if ( loginSelect == "etang" )
	{
		username.name = "login_name";
		password.name = "login_password";
		login.action = "http://login.etang.com/servlet/login";
	}
	if ( loginSelect == "eyou" )
	{
		username.name = "LoginName";
		password.name = "Password";
		login.action = "http://www.eyou.com/cgi-bin/login";
	}
	if ( loginSelect == "citiz" )
	{
		username.name = "emailname";
		password.name = "password";
		login.action = "http://citiz.online.sh.cn/default/login_billing.jsp";
	}
	if ( loginSelect == "yahoo" )
	{
		username.name = "login";
		password.name = "passwd";
		login.action = "https://edit.bjs.yahoo.com/config/login";
	}
	if ( loginSelect == "gmail" )
	{
		username.name = "Email";
		username.value += "@gmail.com";
		password.name = "Passwd";
		login.action = "https://www.google.com/accounts/ServiceLoginAuth";
	}if ( loginSelect == "hotmail" )
	{
		username.name = "login";
		username.value += "@hotmail.com";
		password.name = "passwd";
		login.action = "https://login.live.com/ppsecure/post.srf?id=2&svc=mail&msppjph=1&tw=0&fs=1&fsa=1&fsat=1296000&lc=2052&_lang=CN&bk=1186636991";
	}
	if ( loginSelect == "msn" )
	{
		username.name = "login";
		username.value += "@msn.com";
		password.name = "passwd";
		login.action = "https://login.passport.com/ppsecure/post.srf?id=2&svc=mail&msppjph=1&tw=0&fs=1&fsa=1&fsat=1296000&lc=2052&_lang=CN&bk=1127110962";
	}
}