Q: Can I connect a 17" Dell Monitor to my iMac g5?

Hello!

I have just purchased an iMac G5 from an individual on Craigslist with a broken power supply.  I have already replaced the power supply and the computer now works flawlessly.  Anyway, I have a 17 inch 1440 X 900 Dell display with a VGA connector on the back.  I am wondering if I can use the Dell monitor as a secondary (extended desktop) monitor with the iMac.  The iMac has two firewire ports, 4 USB ports, and a mini display port.  Thank you so much for any suggestions!