function login(){
		var thisform=document.korina;
			if(thisform.mem_id.value==""){
				alert("请输入ID");
				thisform.mem_id.focus();
				return;
			}
			
			if(thisform.pass.value==""){
				alert("请输入密码");
				thisform.pass.focus();
				return;
			}									
			
			thisform.action="/login_ok.asp";
			thisform.submit();
	}