public static boolean isSameID(String c_id) {
		
		Connection conn;
		boolean flag=false;
				
		try {
			Class.forName("com.mysql.jdbc.Driver");
			conn = DriverManager.getConnection("jdbc:mysql://"+Server.DBIP+":3306/po_tweeter","POMA","9353");
			
			String sql="select * from member where id=?"; //ǥ  ȭϴ  ֱ 
            java.sql.PreparedStatement pstmt=conn.prepareStatement(sql); // ˻ ȭϴ  ˻ϱ  PreparedStatement Ŭ
            pstmt.setString(1, c_id); 
            java.sql.ResultSet result=pstmt.executeQuery();
            String logCh = null;
            
            String data;
            
            while (result.next()) {
				data = result.getString("id");
	
				if (data.equals(c_id)){ // ID ˻ ID Ҷ
					flag=true;
					return flag;
				}
			}        
            conn.close(); // 
		} catch (SQLException e) {
			System.out.println("DB Access Error!!"+e);
		} catch (ClassNotFoundException e) {
			// TODO ڵ  catch 
			System.out.println("Driver Load Error!!"+e);
		}
		return flag;
	}