How did they get the font to work on the Adobe MAX website?

I just went to the Adobe MAX website, max.adobe.com, and saw a headline with an interesting sans serif font:

Adobe MAX 2010
October 23-27, Los Angeles, CA.

I just checked the page source and that line is coded like this:

<h1 id="header">Adobe MAX 2010<br>October 23-27, Los Angeles, CA</h1>

I then followed the css file to find this:

h1#header {
  font-family: Arial;
  color: #242424;
  font-size: 21pt;
  padding: 0 0 0 0;
  margin-top: 0px;
  margin-bottom: 12px;
}

Am I reading this correctly? I know the font on that page is not Arial.

How did they get that non-arial sans serif font to look the way it does?

Thanks!