Changing Date Size

I have a java script that I like and recently changed the text on the page to 10 pt. but can't figure out how to change this script to 10.

<SCRIPT language="JavaScript" type="text/javascript">
<!--
// current date
// Array of day names
var dayNames = new Array("Sunday","Monday","Tuesday","Wednesday","Thursday","Friday","Saturday");

var monthNames = new Array("January","February","March","April","May","June","July",
"August","September","October","November","December");

var dt = new Date();
var y = dt.getYear();

// Y2K compliant
if (y < 1000) y +=1900;

document.write(dayNames[dt.getDay()] + ", " + monthNames[dt.getMonth()] + " " + dt.getDate() + ", " + y);
// -->
</SCRIPT>

Any ideas?