Is this an oncidium?

[jen]

Hi, I'm new to growing orchids, I bought the first two at Home Depot (of all places), got hooked and have purchased 39 more since March (I tend to do things in a big way Problem is, I don't know what the first two are. They have tags and one say's "Vuyl. Marfitch and the other says "Colm. Wild Willie". I think they are both Oncidiums because I have found parts of those name in refence to Oncidiums but I really don't know. I would like to know what they are and how to take care of them, specifically, whether I should cut the spikes off now that the flowers have dropped off and if so where to cut them. Any info would be greatly appreciated. Thanks, Jen