急～～～jsp连接远程sqlserver数据库出现问题

[ember_zhou]

Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");//加载驱动程序
Connection con=DriverManager.getConnection("jdbc:odbc//202.70.105.121:dbname","user","pwd");//取得数据源并进行连接

提示

java.sql.SQLException: No suitable driver
at java.sql.DriverManager.getConnection(DriverManager.java:532)
at java.sql.DriverManager.getConnection(DriverManager.java:171)
at DBconnTest.main(DBconnTest.java:14)
这是什么问题啊？？？