Applescript to detect network/internet connection?

I created a simple app using Applecsript to mount my iDisk volume on startup.
mount volume "https://idisk.me.com/username"
Works a treat and I use it on my iMac and Alu MacBook. However, there will always be a situation where I'm connected to a network, but not the internet - EG: My universities Wireless network, where I have to goto the student login page before internet access outside of the university system is granted.
So for the Applescript on my MacBook I want it to detect if it has an internet connection. I was thinking possibly sending a Ping to the idisk location. Anyone have any idea how to do this?
Thanks
~Ben

Oh yes I am aware of the network icon rather than the iDisk icon. But I did it this way for security reasons.
If I had my username and password in the script then anyone who got hold of the script could just double click it and have full access to my iDisk. This way, the computer its running on must be connected to the corresponding MobileMe account for that iDisk.
I'm also not too fussed about the icon, I set a custom one (copy paste into the get info box) which thankfully remains persistant across all machines that connect to match the rest of the pack I downloaded. http://cavemanmac.deviantart.com/art/OLED-Drives-144076760?q=&qo= (if you're curious)
I also had no idea that Applescript automatically detected errors when doing a shell script. So on 100% packet loss it ended the script then and there.
Thanks
Works a treat

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>
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>
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