How can I change quickly proxy setting on safari?

How can I change quickly proxy setting on safari?

Hi, 
Follow these steps to change your proxy setting. 
1. Launch the safari Application. 
2. Click on the Edit and then preference. 
3. Click on the advance and then change settings. 
4. Now click on LAN setting. 
5. Click on the check box of Use a proxy server for your LAN. 
6. In the address fields enter the network name and IP address. 
7. In the port box enter the proxy server port. 
8. Click on the advance and specify proxy if you are using different one for SOCKS, SSL and FTP 
9. Now click on ok