function tj(){
var uname = document.getElementById("user");
var pwd=document.getElementById("pwd");
if (uname.value.length<2 )  
    {  
        alert("请输入您的用户名！"); 
        uname.focus();  
        return false;  
    } 
if (pwd.value.length<3)  
    {  
        alert("请输入您的密码!");  
        pwd.focus();  
        return false;  
    } 
		this.formto.login.value="登录"
formto.submit()
}