How do I connect two microphones to a video camera?

I'm gonna be competing in the Campus MovieFest and I recently purchased two Audio Technica ATR-3350's so I could record dialogue from two people at once. 

So I was wondering, could I have both connected to the video camera at the same time? Or would I need to get a mixer? Also, the video camera is a Panasonic HDC HS100. Thanks.

Here's what the mic's look like: http://www.amazon.com/gp/product/B002HJ9…