Change font in JavaScript in html snippet

Question

I would like a 'this website was last updated' and have found a script that seems to work in an html snippet in iweb but I can't work out how to change the font.  Also I don't want to incude the day of the week but am unsure how much to delete. I'm a novice so if someone could edit the code for me that would be marvellous!  I would like the font to be in Helvetica Neue in size 12.  Thank you
Here's the script
<script language="javascript">
months = ['January', 'February', 'March', 'April', 'May', 'June', 'July', 'August', 'September', 'October', 'November', 'December'];
var d=new Date();
var weekday=new Array(7);
weekday[0]="Sunday";
weekday[1]="Monday";
weekday[2]="Tuesday";
weekday[3]="Wednesday";
weekday[4]="Thursday";
weekday[5]="Friday";
weekday[6]="Saturday";
var d = new Date();
(d.getFullYear());
var theDate = new Date(document.lastModified);
theDate.setTime((theDate.getTime()+(60*60)) )
with (theDate) {
document.write("<i>Last updated "+weekday[getDay()]+' '+getDate()+' '+months[getMonth()]+' '+d.getFullYear()+' '+getHours()+':'+getMinutes()+" GMT</i>")
</script>

Answer 1

Eureka!  I think I've finally done it.  With the help of all of you and combining & editing scripts I think I've achieved it.  It seems to be working anyway.  Perhaps you would have a look at it and see if there are any glaring errors!  Many thanks to you all... I understand it a little better now but I still couldn't have done it on my own.  Thanks again
<div style="width: 250px; height: 15px; margin-left: 0px; font-family: Helvetica Neue, Cochin, 'Helvetica Neue', Arial, sans-serif; font-size: 11px; color: #424242">
<script type="text/javascript">
<!--
var d_names = new Array("Sun", "Mon", "Tue",
"Wed", "Thu", "Fri", "Sat");
var m_names = new Array("Jan", "Feb", "Mar",
"Apr", "May", "Jun", "Jul", "Aug", "Sep",
"Oct", "Nov", "Dec");
var d = new Date(parent.document.lastModified);
var curr_day = d.getDay();
var curr_date = d.getDate();
var curr_hour = d.getHours();
var curr_min = d.getMinutes();
var sup = "";
if (curr_date == 1 || curr_date == 21 || curr_date ==31)
   sup = "st";
else if (curr_date == 2 || curr_date == 22)
   sup = "nd";
else if (curr_date == 3 || curr_date == 23)
   sup = "rd";
else
   sup = "th";
var curr_month = d.getMonth();
var curr_year = d.getFullYear();
var a_p = "";
if (curr_hour < 24)
   a_p = "GMT";
else
   a_p = "GMT";
if (curr_hour == 0)
   curr_hour = 24;
if (curr_hour > 24)
   curr_hour = curr_hour - 24;
if (curr_min < 10)
   curr_min = "0" + curr_min;
document.write("Site last updated:  " + d_names[curr_day] + " " + curr_date + " " + m_names[curr_month] + " " + curr_year + " at " + curr_hour + ":" + curr_min + " " + a_p);
//-->
</script>
</div>