AppleScript

I would like to make an applescript command that mounts volumes on the desktop. I was able to create this sucessfully. My question is, how do I make a command that states, if no network is available, quit.

The problem that I am running into is when the mac is not connected to the server, it trys to map the volumes, when it doesnt map, it gives me access to edit the applescript.

can anyone help?