function check()    //检测密码
{
    var username,password;
    username = document.getElementById("username").value;
    password = document.getElementById("password").value;
    if(username != "autocad" && password != "ara01") 
    {
      alert("Customer ID and Password error");
      history.go(-1);  
    }
    else
    {
        document.getElementById("username").value = "";
        document.getElementById("password").value = "";    
        window.open("../English/library3.html","_parent");  
    }
}

function cancel() 
{
	document.getElementById("username").value = "";
        document.getElementById("password").value = "";
	
	}