Sounds like you have JavaScript disabled. Check your browser settings to make sure JavaScript is enabled. If you're not sure how to do that, let me know which browser you're using and I can give you a hand.
If you have another browser available to try, you might give it a shot there. For example, if you're using Firefox you might try adding a vehicle in Internet Explorer and see if that works. If you're using Chrome on a Mac you might try it in Safari instead.
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