Parse Error with Wordpress Archives

[Anataya]

I'm getting this parse error with my archives for my blog (I'm using Wordpress). I just put up a new layout and before that everything was working fine, and I haven't changed anything about the code, except for re-organizing it to suit the new layout. The parse error goes like this:

Fatal error: Call to undefined function: get_calendar() in /home/element/public_html/jesuis/header.php on line 154

Line 154 would be this bit of code for my webcam:

<a href="cam-nails.gif" target="_blank">click to view full</a>

It's directly above the archives code. I doubt a simple link would affect this, so I don't understand what's going on. Did I mention that this error is preventing any code that shows up after it from appearing? The site itself is here.