function checkpass()
	{if (document.form1.username.value=="tlgd")
		{if (document.form1.password.value=="password")
			div1.style.visibility="visible";
		else {alert("用户名或密码错误！");
 			document.form1.username.value="";
			document.form1.password.value="";
			document.form1.username.focus();
		  }	}
 	else {alert("用户名或密码错误！");
 			document.form1.username.value="";
			document.form1.password.value="";
			document.form1.username.focus();
		  }
	}