// JavaScript Document
	function _login()
	{
		if (form1.n_userid.value ==""){
			alert("用户名不能为空!");
			document.form1.n_userid.focus();
			return false;
		}
		//----modify by fenglimin -------2008.07.10
		if (form1.n_userpassword.value ==""){
			alert("密码不能为空!");
			document.form1.n_userpassword.focus();
			return false;
		}	
		
		if (document.form1.usertypeid.value==""){
			alert("请选择学生类型!");
			document.form1.usertypeid.focus();
			return false;
		}			
		
		document.form1.action="login.asp";
		document.form1.method="post";
		document.form1.target="_self";
		document.form1.submit();		
	}